My crush called me a "poo" because I'm brown. I was really sad. I don't know what to do. Can you give me some tips?

Get a different crush! It sounds like this person is not very nice anyway, and doesn't deserve you. Recognize that just because your crush says something, that doesn't mean that they are right or that it was appropriate to say. You are not a "poo." Look up pictures of amazing people with different shades of brown skin. Are Beyonce or Lupita Nyongo "poos"? Of course not! And neither are you. Recognize that this person is wrong, and you can do so much better than someone who compares people's skin colors to poop. There are many wonderful people out there, so good luck finding someone nice! It may take time, but I bet you will.