I should calm down

I am so in love, I'm only fifteen but man I truly believe this is love.. We're best friends and I want to tell him. But here's the thing, I'm scared, I can handle the rejection if he rejects me but I don't think I can handle the part that comes after it. My therapist was right lol, I am scared. You see it's always been him, I don't want to loose him. I can't talk to my friends about it or my parents so I'm just...I don't know. Frustrated at myself. I'm going to tell him, but I don't know if I can tell him now. I just want to know the answer already.  He's difficult to read, and I don't want to look too much into the glances I seem to catch at lunch or the different texts he may send me every once in awhile. I just want him, but if he says no I'll have to get over him and find someone else. I sure hope that's not the case the though. I like to be prepared for the worst. The worst is losing him. And maybe it's not love, maybe I really don't know what love feels like considering I've never had a boyfriend because I always had a crush on him lol. I believe it is though. This is something I wrote about a month back. It still doesn't explain the way I feel about him that well. But I wanted to share it with you guys. 
Lmao I realized me saying "he's the person I want to hug" is kind of stupid but I don't hug a lot of people and I don't want to think about kissing him because then I'll just want to and I need to calm down and stop going hormone crazy. Pretty much I'm not someone who thinking about kissing someone...well shhh I have recently with him lately lmao