How to i become more outgoing?

i have both shyness and social anxiety. I’ve tried several times to go out with a good friend or a boyfriend and i end up sticking to myself doing nothing and clinging to the person i am with. I only talk to someone if they come to me first. My biggest problem is making friends, i don’t trust anyone hardly and so i just limit myself from people because i’ve been stabbed in the back by so many people i thought were my friend, that i just have given up basically to be around new people. I don’t know what to say or how to react to people when they say or do certain or weird things, i’ll just look at them like they’re an idiot or avoid them as best as i can. I also don’t have a job because of my problems and always get so depressed because i’m like this and don’t know how to do anything about it. I always feel i can’t do anything right, with work or in relationships. Now my boyfriend doesn’t really invite me over when there is a party or something going on because i just usually stay away from everyone else and not outgoing to speak with people like normal people do. I just don't know what to say and fear i will only be cut off yet again after making an effort to be social.