Learning english

I started to learn english since when I was 8, (you could also write: "I have been learning English since I was 8" if you want to use "since".) but I've never cared too much about it.

I consider myself as pre-intermediate speaker, maybe a bit less. I'm in a rock band and most of the song we play are in english. I'm trying to write songs in english, (I'm assuming you want to write many songs, so you need the "s" to make "song" plural.) but sometimes it's difficult to find the right words.

Also, I'm afraid of talking with a native speaker. ( I just wanted to make a note about "talking with". An alternative would be to use "talking to". There is a slight difference, a nuance if you will. Just take them to mean the same thing.)  

I feel dumb when I have to, I feel like my english ain't isn't ( Okay, "ain't" ain't wrong, but I just find it a little too slang-like. XD It ain't consistent with the tone of this notebook entry. Save it for texts and chatting with your mates; all the casual fun stuff. It just ain't meant to be yo! :3 ) good enough and my pronunciation... Is not good.

I want to improve my english ´cause my dream is to travel to England, I have never been in to that country, but it sounds amazing. Also I want to improve my vocabulary so I can make write better songs. (I assumed here that you're talking about writing, because you mentioned vocabulary. However, if I am wrong, you'd want to use "create" instead.) Hopefully one day I will travel to England.

Alright, I hope that was helpful! Now go talk to some English speakers! I promise we don't bite.