But I can't change my personality to be extroverted and happy.
I wouldn't sell yourself short. If you have unknown fears of being social, that's going to feel like "not wanting to be social."
At the very least, consider that your social skills can be improved, with practice over time.
Somebody that sucks at basketball is going to not like playing basketball. Somebody that is pretty good will enjoy it.
Trust me, when you talk to a lady, make her smile, laugh, reach over and touch you, give you that look, you'll want to become more social.
But if you're waiting for that to happen FIRST, then you'll be a waiting a while.
I'd recommend auditioning therapists, coaches. Choose a dude who seems relatively clued in (not a PUA coach).
Just tell him, "I want to be better with the ladies but I don't know how. Can you help me, and if so, how?"
Sort through a few until you find a good one.
Then stick with him (weekly or whenever), do whatever exercises they give you, and keep busy getting rich.
In a year or so, IF you work at it, you'll be getting plenty of pvssy. Pvssy that WANTS to be with you.
It will be a long slow process, but it will be worth it.
(THEN you can consider the mysteries of dermatology if you so choose)