I am a Freshman and I really like this senior girl.?

[Mohammed]

I am a Freshman and I like this senior girl, I have only one class with her and it's Oklahoma History. I didn't really know her but now we kinda talk but she blocked me on instagram and Twitter because on the first week of school I kept following her and unfollowing her so she can like recognize because she wasn't answering me at all, But now we are like partners in class and I really like her.
What should I do? I am kinda scared if I get rejected or people make fun of me! I am kinda one of these famous cool people that knows a lot of people but I am still really scared. She is in Varsity Cheer and they were selling shirts so the money that comes in supports the cheer team and I paid $15 for a shirt, I basically got it because I liked the shirt and I really like her. Please no negative comments.