I hate to give advice about this specific matter, but I kinda had the same experience as you and feel like I should share my experience. I'm 28 and I still value my alone time and solitude very very much. But I also have a group of friends and date a lot which keeps me engaged socially as well and I like having both worlds. What I would suggest is to value solitude and alone time but also be open to opportunities to hang out with other people. If I have to make a choice between going to someones birthday party and playing on the PlayStation, I've learned to choose the former, even if I may not know the person all that much.