OK I liked this girl since like third grade(by the way I'm in sixth grade) and I told her how I felt on valentines day she sent me a note saying she only wanted to be friends but I still want to be more than that so we've been talking a lot and she doesn't really avoid me like other girls and I don't know if she likes me or not. Her best friend keeps on bothering me about it and I'm getting ticked and don't know if she's giving me signs that she likes me.

If she said she only wanted to be friends, then she just wants to be friends honey! Just a piece of advice that may be helpful to you, girls don't like boys to keep coming at them when they have already made their point. She told you what she wanted, now it is time to move on. This sets you aside from the immature. Learn how to accept the word no, 6th grade is a hard place to be, good luck!:)

Be her friend and nothing more or she may end up avoiding you.
Who knows maybe 8th grade, 9th grade, 12th grade she may change her mind but not if you push her.