I am a boy that is in all of the same classes as her and she notices me but I can't find enough courage in me or know that she likes me at all. Also I don't know what to say

Why don't you work on getting to know her and talking to her instead of worrying about asking her out.
What does "asking out" in 6th grade mean anyway?

How about inviting her and a few friends to a pizza party and movie night or board game night at your house? That way you will have others around to chat with too and something to talk about, and aren't "stuck" trying to figure out what to say after "hello."

I got to know her a little bit and we are now friends but I am taking it slow

Have you talked to your parents about whether you are permitted to date? Sixth grade would put you at 11 or 12 and in my opinion, that's too young to have a girlfriend