These are very difficult issues for someone 13 years old to have to cope with. You are getting more than your share of the rough times right now. All of the things you have noted are annoyances that certainly warrant your reaction. None of it seems to be fair.
It sounds to me like you need to deepen your friendship with the three people you are close to as you expand your friendships to new people. I would also find an adult to talk to. The first place I would go is your school guidance counselor. He or she has a lot of experience with exactly these issues and can guide you through them.
You sound like a very responsible and loyal person, and it may be time to protect yourself from those people who aren’t treating you fairly. Stick with your friends that have been there for you, make some new ones to replace those treating you poorly, and talk to your counselor or trusted teacher about what is going on.