Im not a Lonely person but im always broke and dont like people to invite me to things ,what should I do?

Honesty is the best policy. Tell them you can't afford to go to things at this time. Tell them when you are making better money you'll let them know.

Find a job

explain this politely to them. That you don’t want to feel like you’re taking advantage of them in anyway and that if you had money it’d be on you. If there’s anyway that you can find an income, go for it and then treat them when you have money.