Not much more to add considering the suggestions given you by both CADad and jd. I agree with CADad that you should be throwing mostly FB. I also agree with jd that you've "got your head on straight" in realizing that too many pitches are not good. Three pitches (FB, curve, & change-up) are fine for your age.
Considering with the FB alone you've got a minimum of 4 pitch grips -
4 seam-balanced (thumb directly under forming a "V"), 4 seam-unbalanced (thumb slid to the left side of center with ball facing catcher), 2 seam-unbalanced - cut fastball (thumb to the right of center with ball facing catcher), 2 seam-unbalanced - sinker (thumb to the left of center with ball facing catcher). Add to that your 12/6 curve ball and the circle change-up and you're definitely "good to go"!.
If you change speeds, mix pitches, and vary location - (remembering that any pitch you take into a game has to be able to be thrown for a strike) you should have a fine season.
The fact that you stated in your post that you knew you were throwing too many different pitches tells me that you were already willing/wanting to cut down on that number. You just weren't sure which ones to keep in your repetoire.
Fortunately, as you have found, there are some very knowledgable people on this web site who are always willing to help (like the good advice given you by CADad and jd). That's why I enjoy it so much.