Uncomfortable in body

Hi all, the size of my boobs have been really bugging me recently. I'm in my early 20s and for the last 3 years I have become very uncomfortable with my breast size. I am slim (5'8ft 54 kg) and have an athletic build but my boobs look so out of place? I look more on the masculine side with the way I dress so they are really throwing me off and I SWEAR they are getting bigger. I don't know what to do but I am finding it harder and harder to put on tank tops, etc. without feeling bad about myself. I really don't like them and I don't know what to do? I am trying to really target my pecs at the gym as well as start to burn off fat in the hopes they reduce a bit. Does anybody have any tips?