I feel lonely and desperate what should I do?

Is it normal to lie in bed half the day and stay in your room all the time. And have no friends at all?
Im 21and everytime in my age has frnds goes out and simply has a life and a job. I have none.. and I feel sad when I see how helpless I am. Plus Im heart broken although the relationship ended 7 month ago. And Im still waiting but I know we won't get back together. Im quite sure he cheated on me too..
I dont have a very good relationhip with my parents and I feel like they are holding me down.
Any answer would be helpful thank you :)
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I feel lonely and desperate what should I do?
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