What's wrong With me?

Ok, so I'm like super sad right now... I feel like I'm a social outcast at my school. D: Im really weird, I have barely any friends, really shy too. I know shyness comes from a low self esteem... which makes sense. To be honest I feel like I'm ugly too! I don't really look ugly, but im sorta fat... Contributing to that whole self esteem thing. I always wear black since I hate stabding out, and prefer to hide from everyone. To be honest I'm not smart, I get mostly cs and bs, and people make fun of me, and I'm getting really annoyed! Some guy has been flirting with me, I can't tell if he's serious or trying to ember me, also I'm into girls, Im straight. I know you have to get out of comfort zone to make friends, but I just can't, it's too hard for me. So in a nutshell, I go to school where I do average, hide from everyone, and get picked on all tge time. If it's my image, this is how I appear... I'm slightly overweight, I have long dirty blonde hair extending slighy below my shoulders, average face, occaisonally wear gles, always wear all black and a hat, look slightly goth, without makeup and piercings I guess. usually found reading poetry, mythology, or Edgar Allan Poe while listening to alternative bands like MCR. Please help me, my life is really depressing me!