I sound so English!
I just recorded my voice reading out some text in Spanish and played it back. OMG I sound soooo English. I was beginning to wonder why, when I walk into to a shop or bar, here in Spain everyone knows I am English (and I don't live in the tourist part). I am dark skinned and dark haired (people say I look like a gypsy) now I know - my voice speaking Spanish comes over "plumb English" (Very posh in other words) What can I do - it sounds so false!
10 Answers
I think you are worrying needlessly. You probably do not come across as posh infact you do not need to sound posh to come across as English. ..natives can recognise when a person does not pronounce the words as they do even allowing for regional variations in a Spanish-Speaking country..
Some good advice has already been given but I would encourage you to:
1 Listen to the way that natives pronounce some of the words in Spanish especially when they are greeting each other or saying goodbye and the sentences are likely to be shorter.
2 If you can make a friend or two of the natives ask them to correct your Spanish and learn from them
3 Focus on developing a basic vocabulary and improving your general pronounciation and don't worry about developing an authentic accent this will come later.
4 Join Skype and participate in a language exchange where you help a Spanish speaking native with their English and recieve free help with your Spanish in return. This experience has been reported by many people as an invaluable means of improving knowledge, understanding, vocabulary in addition to improving your pronounciation.
5 Listen to Spanish songs
6 .Practise reading out Spanish aloud
7 Visit LoMás TV website where you can listen to natives speak Spanish on short video clips and control the speed of the listening experience as well as view subtitles in Spanish and /or English
I hope this helps 
Stop worrying. Whatever it sounds like to you, the Spanish will absolutley not think it's POSH. Seguramente. Just carry on and hope things will improve. I have a Swedish accent. My teacher has told me it';s very good because it makes my Spanish very' clear.. Excellent, everybody can correct all my faulty endings, total bliss!
What you describe is actually a blessing in disguise , because they , the Spanish,
realising right off that you are a "foreigner" will then reply more slowly .
There are two countries in which I travel where I speak the language but not
in any way fluently but my accent is authentic , this causes me trouble
because they respond in rapid patois thinking I am understanding everything
but I am lucky to get the first and last word . So take your time and concentrate
on the grammar and understanding , the accent can wait.
It is possible to ¨" lose your accent" I am an American and have lived around Spanish native speakers for 5 years. I still have a few vices in the area of swallowing the " s" in Unas and a few others, but in a voice recording you may ask, Hmm what part of the Spanish speaking world is he from. It takes practice ,lots of practice,but the more you practice the easier it gets.
The biggest problem with us English speakers is our Rs and our Os, our O is always too long and when people mock us they always say "bway-noooooh"
The R is particularly hard if you're English what i've been doing is putting in short texts here: http://www.acapela-group.com/text-to-speech-interactive-demo.html (change the language to rosa or antonio Spanish)
and repeating every word over and over again until i get it right, then recording my voice and listening to it to see where it sounds different from the robot. Of course I'm not going to learn to talk like a robot, but their pronunciation is perfect and it's something to aspire to I think.
Then when you get past those beginner problems check out the threads here on Spanish Dict and read all of the comments that Lazarus and Cogumela made about the English Speakers speaking Spanish, because we all make the exact same mistakes as each other.
We'll always have accents, there's nothing wrong with that, but I don't want a really strong accent because I know it's painful to listen to at times.
hahaha!
That's the way it goes.
If you want to soften your accent, then start doing the same thing you just did.
Read a whole paragraph out loud while recording yourself. Go over it and pinpoint what you don't like paying attention to intonation too.
Re-read the same paragraph paying attention to "fix" what you didn't like and re-listen.
Re-do till more or less satisfied. Please don't get too strict with you, especially now that are beginning. You'll see that people will start complementing you sooner than later.
No te preocupes 
Nothing wrong with having an English accent but all you need to do is talk talk talk untill you sound more Spanish.
So long as you are understood why worry? You will probably always have an accent even when you are pronouncing things well, communication is the main thing.
I haven't heard a foreigner yet who speaks English with a completely English accent, and what is an English accent anyway? There are so many English accents I find some of them hard to understand. I find it easier to understand my brother in law for example, who despite his excellent English still sounds Spanish than some of the people who come from the Forest of Dean just a few miles down the road from me in Gloucestershire.
My advice, practice with some Spanish songs, listen to the lyrics very carefully and repeat (even if you had to sing along with them)!! it worked perfectly with me, l did this to learn correct English pronunciation and then l did the same for Spanish, and normally l don't have any problems with neither of them when it comes to pronunciation 
Another option is to listen to Spanish being spoken and repeat every word with the same sound the person is pronouncing it, it may sound funny but at the end you'll have your own way of speaking Spanish after picking up a few words from this and that, it's hard but it really helps.
Speak like a Cockney Caza, that´ll fool ém
