I didn’t go for reconstruction either but what works for one isn’t necessarily the right solution for another. I was much older and while I quite liked my breasts, they weren’t particularly special or lovely (my husband likes them a lot more than me!). I never really fancied reconstruction, being large breasted it would probably be an implant, need a replacement at even ten years older! Lop sided has never worried me, I’m comfortable with a prosthesis but I know others never really adapt to either. My surgeon never pushed for reconstruction but I know that given a chance, he’d still go for a reduction in my remaining breast and reconstruction to give me two much smarter breasts! Always remember that surgeons, no matter how good and mine is just terrific, love to have an interesting reconstruction to look forward to!
One option as @Fleur52 has said, is to try flat and see how you feel, you can still have reconstruction later if it’s not for you.
Best wishes.