Help. i lost all hope! i used 2 b able to get a b/f in the blink of an eye. whats going on with me these day?

so this guy that ive liked for about 4 weeks..is soo amazing...i was soo crazy for him...he made me smile, he made me laugh, he made me anticipate going to school everyday. That was untill today...ok so im 15. 10th grade, currently single. Today i finally got a note from kaleb the guy i like..telling me how, im just a friend to him, he is sorry but he doesnt see past that. I was crushed. My heart BROKE inside, and all my hopes were shattered. The last month or so was full of anticipation, and hoping, he liked me (because although he knew that i liked him, i never got a response so i was giving him space) and i got my answer today. not exactly the one i was looking for. I dont understand. my freind told me he said i was trying to hard?!!! he likes this girl in the 11th grade. and she doesnt even like him!!! i feel like im really one the short end of the stick. i always fall short of some of the greatest chances and possabilities in life!!! what do i do..im so sad and dissapointed?!