… You’re Bronze. Bronze you just need to learn how to generically play a FPS game and you should climb. Why don’t you try instant-locking some DPS and get good at it. If you have an idea of how to play an FPS game you should be at least Silver, probably Gold.
Take a one-trick mentality until you are within the average player base rank. A Blizzard post from February says that the average player rank is Gold. - Competitive Mode Tier Distribution
After you reach Silver or Gold look for a role that you really want to play or small selection of heroes that you like. I personally have 3, Winston, DVa, Roadhog. Explore the heroes learn about them all. You don’t need to go in depth, just enough to find what you like.