Reading this makes me so so upset. Eurocentric beauty standards have truly plagued our society. For what it's worth, I, with all my heart, think that dark skin is beautiful on absolutely everyone, including you.
However, I know from experience that when you're insecure about something, it doesn't really help for other people to give their opinion, you need to love your skin yourself, which is hard but possible. When I'm insecure about something, I usually find instagram models or actresses etc with that exact feature to follow so that I can see that that feature doesn't make them less attractive.
Also, I think that to feel more confident in your own skin, you need to do other things like stay healthy, maybe wear some makeup and do your hair so that you gain an extra bit of confidence.
All I can really say is that one day, I promise, you will learn to love your skin and you'll be so happy that you never bleached your skin, or did anything to lighten it. It's a process to love yourself, but it WILL happen and I 100% believe in you. Good luck <3