I feel like something's wrong with me, why don't people like me for who I am?

[AA]

I don't know why. I always try to be nice but I just feel like I'm pathetic or annoying people. At school I see everyone having a close or best friend they can be themselves around. I can never be myself around anyone(Except a girl but I haven't talked to her anymore)
I tried joining hobby groups, I do horse riding that's what I would like to do in the future, but even there I see girls hugging eachother. I WAS myself there but people didn't like me as I was. When I wasn't myself it just seemed like people came around me more, but it's very uncomfortable not to be yourself. I cry and am jealous while looking at girls who post pictures on facebook on how much fun they had. Why do I feel like I"m annoying everyone and am pathetic? I TRIED to be confident and believe me I AM confident,but that feeling people give me has put me down a lot. Also about that girl I haven't talked to her since I felt the same way towards her at a point.
Also, for some reason online I have TONS of friends, real friends I can be myself around with. They love me for who I am, I have many online best friends.. why can't it be the same irl? :/