okay im 15 and theres this girl I like and last year we always talked and she would write me letters and make excuses to hold my hand but this year I never see her and when I do she smiles and says hi I want to know if she likes me and also how you would come about asking her out if you never see her any help would be greatly apprectiated
Well, a great way to keep in touch with someone you don't see often is to talk to her online, through IM or text message as i'm sure you know. Learn to read her non-verbal signals, and pay attention to what she says and how she responds to you. It sounds like you have a good start there.
I mean, the best way to find out is the direct approach; ask her to hang out or if you're feeling brave, go on a date. Rejection is scary, that's for sure, but it's worth the risk!
You really have nothing to lose by asking her, just be honest! You can do it!
This is kinda hard to tell. It sounds like she likes you, but at that age girls are always changing their minds. It could be that because you never made a move she though you didn't like her. But if she had feelings for you before than those feelings wont just disappear. You should probably start texting her like when your out with your friends, invite her to parties that your at. Try to flirt with her via text, or on the phone. If nothing else it will let her know that your interested.