I loved your post! You seem very dedicated to music and also very open-minded. I also appreciate that you shared your age, because it makes it easier to picture your situation. You've been told that your repertoire is too often played, or something like that. The catch-22 with this issue is that if you play the well-known standard pieces, you will get that said to you a lot. And if you do not play those pieces, people will say in disbelief, "You mean you NEVER played the such-and-such???" So it's probably useful to just look at what's good for you. Which is probably (1) to enjoy your music/life, and (2) to be prepared for the next big step in your musical education, which I guess would be college.
For (1), play music you choose yourself and really care about, whether it's "overplayed" or incredibly obscure. You already know you love Chopin, which is great. There are so many composers who wrote incredible music for the piano. I guess the quickest way to discover them is to listen to good performers, see what they play and make a note of everything you like. There will be other composers and pieces that will become special for you if you get a chance to hear them-- this won't ruin Chopin for you, because he will always be one of the greats.
For (2), you want to know what the repertoire is that would be expected of an incoming performance major and start working on that. It's different with every teacher or school, but the following are very likely. They'll expect (or appreciate) you to know some Chopin (yea), Beethoven-- maybe look at another sonata and some shorter pieces, BACH! some inventions and a French Suite are good starters, MOZART! find a sonata you like, Scarlatti sonatas (these are short, there are tons of them, and they greatly vary in mood and difficulty, so it's easy to find something you like), Debussy, Schubert, Schumann-- also big variety in mood and difficulty w/ a great many short pieces, Brahms-- big variety w/ many short pieces to choose from (or do a whole set), and Skryabin/Scriabine (var spellings)-- some of his work is a little out there if you haven't experienced a lot of repertoire, but some of the short pieces are lovely and lyrical, and certainly difficult enough to be interesting playing. This is only a short list, and you'll get great suggestions from other people. Best of luck!
I forgot to ask, do you have a teacher? This is important. If you're playing big pieces and working on your own, there's some chance of harmful motions and unhealthy use of force. This doesn't sound that ominous in writing but is actually a very big deal. It's important to have someone knowledgeable keeping an eye on you while you keep developing. My apologies if you already have someone and here I am trying to sell you on the idea! Anyway, best wishes.
Topic: Help: Everything A Student Must Have