How do I accept the fact that without being on my antidepressant I am mentally unstable?
You have already accepted it. If you hadn’t, you wouldn’t be calling it a fact. Congratulations to you, it takes courage.
So you already know that about yourself, that’s not an issue here. The issue here is that you either want other people not to know it (because you’re ashamed), or you want other people to accept it, too (because you want their acceptance). Either of those is junk - don’t worry about what other people think of you. The best you can do is be honest with them about yourself, and those who truly love you will keep loving you, trust me. Just open up more, and you will see.
As for the instability itself, try meditation and other techniques for calming your mind. If I were you I’d focus on meditation and then slowly ween off antidepressants and try psychedelics instead, which is what I did when I was severely depressed, and it worked better than anything else. Just know that it can be somewhat dangerous to mix psychedelics and anti-depressants. Psychedelics are physically safe, by themselves, but anti-depressants are not a good mix, because they work on the same receptors.
I was meditating, too, every day - it’s a very good habit to take on for you right now, it’s like brushing your teeth, but for the mind. Think of it as mental hygiene.
Good luck!