Just because someone else does not want you, doesn't mean you shouldn't want yourself. You gotta be the biggest advocate for yourself most days, and that's just how it is. You gotta embrace you like you embrace other people because you are all YOU have in life. It is you, your thoughts, your actions, your personality, and everything that makes you, YOU that is worth celebrating. Literally, no one else in the world is you, and that's freaking beautiful. Never apologize for being too much for someone else. If they cannot handle your genuine love of life and the way you express yourself then, they are not worth your time.
The worst thing you can do is try to change to fit an idea of what they want. If they want you to change to fit some bullshit mold, it is probably the most convenient option for the other person. What they don't see, is your beauty, your grace, and your awesome fucking personality that clearly does not deserve to be messed with. If they really saw your worth, they would realize they would not want to change a damn thing.
Feeling unwanted is arguably the worst thing in the world, sure, but it does not have to be. The art of rejection, in my eyes, is that it opens your eyes to someone's true character. If they reject you for being yourself, you do not need them. If they reject you because you won't do something for them or push your priorities aside to accommodate their way of life, then you do not need them. If they do not make you feel as good as the sunshine does when it hits your skin after a week of rain, then they probably aren't "the one" and you definitely do not need to spend a second more with them. Even if it is dating around, FWB, or just plain "complicated" no one deserves to be made to feel lesser than they are.
Another misconception is that spending the time to those who reject us is a waste of time. Without devoting time to that person, you never would've known (that they suck) and that it would not work out. No time is wasted because you usually come out on the other side with some new-found self-realization about life and love. If you find yourself down in the dumps, know that it does get so much better. I hope you find yourself empowered shortly because this rejection does not define you nor does it define your worth. Go chase that dream that's been on the backburner. Hit the gym, cut your hair, eat a burger, write it all down. Do whatever the hell you want. You do not need closure from them, you do not need anything more from them. They showed you who they are, and unfortunately, they will not help you move forward in life anymore.
Most importantly, you do not owe anyone a god damn explanation for why you do the things you do. Start living for yourself, the less you'll give a shit what other people think, and the stress will melt away. Sis, I believe in you. Keep learning to love yourself, you've earned it.