Plastic surgery

So I’m 20 years old. From a young age Iv always been bigger. I go to the gym 4 days a week for at least 1 and a half hours And I watch my diet. No matter what I do I can’t seem to keep weight off. My self confidences horrible...as well as my mental state In general. 😥😭 When I told my mom I was thinking about getting liposuction and she’s 100% supportive. I guess I’m just asking if anyone has any recommendations if you have gone to someone or any tips...

I guess I should have explained I’m not looking at doing it right away... I was thinking like my 21st birthday which is a whole year away because my birthday is in February... I just don’t know what else to do at this point it’s not like I’m going to stop going to the gym and such it’s just if in a year I still don’t see any improvement I’d like to have it done.