I feel so alone my 'friends' dont really care for me

I have a loving family, i have good self esteem and i have plenty of opportunities to be a happy teen. The one thing thats bothering me though is that i know im alright looking, i have a nice and quirky personality (people have told me, im not big headed ) and i have people who like me. I wouldnt necessarily call them my friends though. We have fun and are friendly towards on another and share secrets and stuff likes best friends do, but my 'friends' dont really care for me. I can tell. Its just that if i ask them to go out or come over to hang out they always make excuses or are 'busy'. Im in half term atm for 2 weeks, and havent been out once with anyone. I ask loads of people to go out or hang out and they just dismiss me. I see on fb all of these people with hundreds of pictures of them with friends, and going out everyday or with friends most of the time. I want to that. I just think, what could be so wrong with me that no one really likes me. This may seem shallow but no boy fancys me or wants to go out with me and im just getting so sick of all of it. I know im not some freak who everyone loves to secretly hate, but it is just getting to the point where everytime someone rejects me im so used to it i just say to myself before they say no, why bother its never going to happen. Its getting so bad that i have been thinking of suicide for like a year (but anger comes from this and i want to kill my self because im so angry coz im alone :/). I know ill never do it, its just i want to feel appreciated apart from my family. Thanks to anyone in advance. From a 15 year old looser.