Does anyone else feel like their 20s are going to be a waste?

I turned 20 earlier this year and and will be turning 21 soon. Turning 21 doesn't really feel like a milestone, and there aren't really any more milestones after that.

I used to look forward to drinking and going to parties, but now I just don't. I was invited to drink with my older family members when we all met up and I had no desire to drink the whole week. I took a glass of wine and couldn't even finish it. I find drunk people to be much more of an annoyance.

Similarly I don't really go out to events or parties with my friends anymore, because i don't want to drink. I don't want to be designated driver all the time either because I dislike babysitting drunks. I'm not meeting new people or making new friends either. And now I'm beating myself for "wasting my youth." It's like a flip switched in my brain.