I don't speak english because of my thick accent
You don't speak English because of the accent or because of the language?
I am scared my English is really poor.
Being multi-lingual is something to be proud of. Find a person who is trying to learn your native language and speak together, you will both learn from each other!
I should ask my friends sometime.
The more you practice even if you aren't good right now will improve. You can ask to talk with someone and have them correct you. They might be too polite to not say anything unless you bring it up.