I'm 19 and considering a Breast lift or reduction; which is better?

Hi I'm 19 and have a size 38jj natural breasts but I have a slim body and they sag and I have to wear a bra with straps whenever I go out So I have dents on my shoulders because they are so heavy I just wanted to know if it's better if i have a reduction or if I have a breast lift can I go out without a bra?

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