I am tangled in my thoughts all the time

I am too busy thinking all the time. I am not able to command my head to stop thinking. I have a busy schedule but even after being busy for the entire day, I am not able to get the thoughts out of my mind. This makes me feel sick. I get annoyed of everything. I have started ignoring people because I don'twant people to know what's going on with me. I fear people. I feel like they are judging me. I feel like they know what I am hiding from them. I am trying my best to stay happy, to do things that used to make me happy but the Same things doesn't seem to have the same impact on me. I feel burdened. I have started enjoying my own company. And at the same time i hate it. I am sick of this feeling. I need help.