Breast reduction?? Please help!

Hi ladies! So I'm 18 years old (my bday was yesterday), 5'3, and I'm 150-160 pounds,

and I've been a size 36DD since I was 15-16 years old. I used to be super small and skinny, then out of no where I got "thick". I've gained weight and I went from a super flat chest to a C cup in a matter of weeks honestly. I feel like my body didn't really have enough time to get used to them or adjust to the new changes, if that makes sense. My back aches every day. My be straps dig into my shoulders, but if I loosen them my boobs will sag. I don't want saggy boobs at the age of 18!! So I just have to deal with the pain. Do you think I should get a breast reduction? What are the pros and cons? What would you do?

That's me in the middle!