Alevels at 19

I turn 19 this summer and in september I'm going to be doing my a levels. I used to be self concious a lot about it before but now I don't really feel embarrased about it but sometimes the self doubt just bothers me. It's just that I would be 21 when I finish so I feel like I'm wasting two good years of my life instead of being in uni. Also one big factor in all this is that I was homeschooled starting from Year 4 onwards so I already feel like I haven't acheived anything my whole life. I literally have no idea how classes in college would work and since I'm new to this country I don't know anyone 🥲 If anyone could kindly give some tips or advice on my troubles I would be really grateful.

I turn 19 this summer and in september I'm going to be doing my a levels. I used to be self concious a lot about it before but now I don't really feel embarrased about it but sometimes the self doubt just bothers me. It's just that I would be 21 when I finish so I feel like I'm wasting two good years of my life instead of being in uni. Also one big factor in all this is that I was homeschooled starting from Year 4 onwards so I already feel like I haven't acheived anything my whole life. I literally have no idea how classes in college would work and since I'm new to this country I don't know anyone 🥲 If anyone could kindly give some tips or advice on my troubles I would be really grateful.