need help! friends? or can it be more?

hey! I am a 18 years old boy. I am sorry for bad english.

I have a big problem woh really bothers me! I¨ve met a girl this summer who really is the one! I have had other girls before but i feel very different know. I care about her and I am really worried for her.
The problem is that she are very unsecure on herself. She uses long time to get feelings for people and offcourse I understand that. We had a talk and she wante to continue meeting me and just see what happens. We know each other very well so I wonder if there is something I can do to convince her or help her get feelings for me?

I am truly sorry for bad english but I hope you guys understand, because I cant live without this girl. Its either her or single for rest of my life.