I so can identify with how you feel about yourself and the difficulty you are having mixing and connecting with people.
It's great that you have a job with a future!
Even if you aren't outgoing and cheerful there is one almost infallible way to make contact and be with people. Find a charity and volunteer. If you are helping others you don't have to be a rock star. Just wanting others to be happier is enough.
Also I think you can go to an ER and see a Dr. about your depression.
Keep posting on this site and join some clubs and maybe chat. Here are folks who will really "get" you. That makes you feel accepted and less self conscious.
I'm so sorry you are having a rough time.