Build your confidence. For example, practice good posture. If you're always slumped over, it seems like you're withdrawn and sluggish. Compliment others around you. All the positive feelings in the room will eventually find their way back to you, since people will want to be around you. Don't be afraid to make eye contact with others around you. Spend some of your time volunteering in the community. You'll not only make new friends, but contribute to a good cause.