Wasted 3+ years of my life not being able to figure out what to do at uni

I would love some honest advice.

I don't know exactly why beyond a few anxieties like perfectionism and worrying about regrets with picking my course (there's a lot of courses in stem I like but not sure if theres any that sticks out to me / prospects (better to delay than get a degree half-heartedly), but I'm 21 now and still not at uni. I was meant to enrol in Manchester in 2022 and 2021 but I wasn't sure yet then either ...

I could go uni now as Lancaster's clearing for physics is open but I think its a worse location than Manchester which sucks but its the one open now for 2023.

I'm also wondering how uni will be at 21 / 22 / 23, as 2025 entry will be the latest ill go uni. I know people say uni is for all ages but I want to have the uni experience somewhat as well, and I want brutally honest truths here - will I be too old to fit in at 22 / 23?

What have you done in the 3 years to help you make a decision?

I would love some honest advice.

I don't know exactly why beyond a few anxieties like perfectionism and worrying about regrets with picking my course (there's a lot of courses in stem I like but not sure if theres any that sticks out to me / prospects (better to delay than get a degree half-heartedly), but I'm 21 now and still not at uni. I was meant to enrol in Manchester in 2022 and 2021 but I wasn't sure yet then either ...

I could go uni now as Lancaster's clearing for physics is open but I think its a worse location than Manchester which sucks but its the one open now for 2023.

I'm also wondering how uni will be at 21 / 22 / 23, as 2025 entry will be the latest ill go uni. I know people say uni is for all ages but I want to have the uni experience somewhat as well, and I want brutally honest truths here - will I be too old to fit in at 22 / 23?

No one will notice.And no one will care either.

I believe that to be true but theres more to consider as well. I really want to make friends with people my age but sadly that's not how its been planned. My friends have graduated / last year left of uni so they'll have jobs while i'm still stuck on the other side.

And I would love to know if people in their early 20s can fit in being in first year? I don't want to be considered old / wiser