I think my empathy is limited
Why do you think it's limited?
One reason is my parents neglecting me and giving more attention on my brother.
You can't control the amount of empathy you have by yourself. You can go to therapy to resolve those past issues and see if you can control any animosity you might have left.
I don't think you can help me. I've been trying for years, maybe it's time to seek help from professionals.
That the best way to handle your problems if your friends can't help you. They have the experience and knowledge to help people like you.