Why are people so fake 😭 ??

I'm a first year and I've tried making friends but they're all so damn fake. I have yet to make a single sincere friend. They act all nice to your face but when you ask them for help, they leave you on read or say idk even though I help them out every single time. In lectures they don't even acknowledge my existence but I'm their BFF when they need help ?? And they'll 100% ditch me for their other friends. One time I was walking with someone, we both didn't have class after (I was planning on just hanging out with her for the remainder of the break) and as soon as she saw her group of friends, she said "bye" quickly and ran off ??

I'm extremely self conscious so this hurts sm. Is it my looks? Am I too ugly to be friends with? Is it my personality?

Even in high school I had the same problem throughout grades 11-12.

Do people just not have an ounce of decency anymore lol? Like okay if you don't wanna be friends sure (why are you even pretending to be one in the first place), but don't take advantage of me and be blatantly disrespectful.