Feeling lost and behind in life

I (19M) feel lost and behind in life. I have primary inattentive ADHD, got diagnosed a few months back around August. Got on vyvanse and it’s definitely helped me focus and get things done, but I still feel down. I basically only have one friend (my best friend), I’m still a virgin, I haven’t even had my first kiss yet (I blame my RSD), I’m not talking to any girls, I have low self-esteem and confidence. At family gatherings, I’m almost always the most quiet one. I show almost no emotion and I can tell people pity me/look down on me because I’m not outgoing or confident. I just don’t know what to do. I wanna be more confident and talk to more girls and just people in general, but it feels almost impossible. What can I do?