Anxiety, lack of interest, insomnia.

I'm almost out of college and looking for a job. However, I do work part time so that I don't have to take a lot of money from my parents, who only have me as a child. I constantly worry about not being capable enough or smart enough to do anything. I feel quite lethargic and disinterested at times. It feels like nothing is worth it. I have enough friends but a very few ones I confide in. My dating life doesn't exist. People annoy me easily at times. I would rather just curl up in bed and watch something than go out. I feel hungry but when I start eating, I feel like I ate too much too soon. I occasionally smoke and am not that fond of drinking. I want to be a successful person. I want to have a nice friend circle around me. It feels like things are only getting worse. There is not much to look forward to. Most of my friends stay far away. I am not even sure if I have expressed my problem here properly. Please help.