Slowly, and one step at a time. Where do you volunteer? There are so many organizations with so many people that need assistance. Perhaps you can do some of the work on your self-worth by volunteering in something where there is a lot of positive feedback - senior citizens organizations, nursing homes, etc. often look for transportation aides to volunteer. And when you do that work, thank yous come in bunches. Good luck. You can also try to connect with people in religious groups, they are usually very welcoming. If you have any problems with substance abuse, try a recovery group - they are also very welcoming. Good luck to you.