I feel so ugly

I’m literally probably over reacting about this but I genuinely feel so crap right now .. I feel like a joke to everyone and I feel humiliated. I just wish I was invisible. I was in class today and some of the girls was giving me stares and just whispering and laughing at me. I know I’m not the prettiest or slimmest girl I don’t wear makeup cause I’m not good at it so people will just laugh anyway so I just keep my head down every time I go to college... 😔😔I feel paranoid whenever someone’s laughing or staring I don’t wear the best clothes because I just feel ugly in them so I wear basic stuff. Every time I’m in class no one likes to sit next to me or work together with me. I just have to keep a straight face but I’m so broken inside... I have to sit alone each lesson because no one likes me on their table, I have to walk around on my own too and I feel I’m over reacting because I wouldn’t say it’s bullying but it’s just the sort of eye contact they have with their friends or how they go silent every time I get asked to work with them. I know as there’s worse things going on but I just feel so humiliated and hate myself it makes me tear up writing this I just want to curl up and cry. I’m 17 I feel I should be stronger but I just look at other girls and how confident and pretty they are but I just get so many people talking down to me like I’m an IT or an animal and not a real girl😔😔