What do you honestly think about breast surgery?

I have small breasts and I'm not pretty, but to begin with, I like boxy clothes rather than feminine clothes and I like a bit of a hip feel, so I loved my small breasts (the fit is actually better when I wear boxy clothes, so I purposely went without a bra.. but it's funny)
 
But there was something about it. As I get older year by year, and there are people around me who have had breast surgery, I am envious of them and they look pretty and sexy.
 Then, at least once, when I am young and pretty, I want to wear sexy clothes and a bikini with confidence, and not just go somewhere and cover up my breasts. I want to go there with confidence
 
, but honestly, if you look at the reviews, they only have good things to say, but the side effects are scary and there are a lot of people saying it's a time bomb... I was worried a lot.
 When I told my mom, she didn't completely oppose it. Instead, she acknowledged that I have small breasts and said I would do it, but she told me not to harm my health because health is more important than being pretty. She said I might get cancer... .

But it feels like even if I don't do it now, I will do it someday?
I'm still in my early twenties, but my breastbone is exposed and my breasts are saggy, and I'm scared of how much more they will sag as I get older... ㅠㅠ At that time, I would really hate it and feel embarrassed.
 
Can anyone who has had breast augmentation or has thought about it honestly tell me whether it was a bad idea or a good idea?