My 16 year old cousin thinks my life revolves around his because I’m an unemployed adult

I’m 19 and I can’t get a job currently for multiple reasons, and because of this my cousin thinks i should do absolutely everything he says. If he wants me to go somewhere where with him he’ll try to force me, then if that doesn’t work he’ll try to bribe me. He’ll text me things like “I’m coming to your house, let me in” and when we tell him we’re not doing that he’ll offer me money because he knows he can’t make us let him in. He also gets EXTREMELY jealous when I do something without him, like if i mention I went somewhere he won’t talk to me for days. And GOD FORBID someone buys me something and not him, even tho he’s not there. The worst part is my mom loves him more than me because “he had a tough childhood”, like mom you drank and beat us and he was occasionally bullied at school. Idk, it might just be the unemployment getting to me but i absolutely hate him. If I knew better at that age then he does.