What's the point of life if everyone only hurts you and stresses you out?

lately I feel so down, I'm finding it hard to get a job, and the jobcentre are constantly on my back with crappy programs that are supposed to help me get a job, last time I was there, the person promised I would get one, and I didn't get one!, she just kept telling me contradicting advice, apply for jobs online, don't apply for jobs online, apply for different kinds of jobs, only apply for the same type of job! I got so stressed by all of it that I started having anxiety attacks and went on esa for a while, they also told me that while I was looking for jobs, they would send copies of my cv to jobs they get access too first as well and they never did! now I'm back on jsa, and the jobcentre already want to send me to the program that made me ill in the first place! I'm also down because I have no friends, I used to have some a few years ago but they all stabbed me in the back, because of that I decided it's best I try not to make anymore ever again because they'll only stab me in the back at some point, not that I could make friends because my teeth are quite bad and I'm afraid to go to the dentists, so likely they would judge me from that. I'm still with my parents as it takes ages to get a place, don't get me wrong, I'm not going to try and end my life because I'm too much of a coward and scared of death, I just want to know how I can stop feeling so worthless