I’m only 15 if my dad doesn’t have custody but my mom sent me to his house can I leave and tell police I want to go home??

Your parents have the right to determine where you live.  Thus if they both decide that you should be living with your father, you likely should try living with your father.   If, however, your mom put you out and your dad refuses to take you in, that might be give rise to a charge of "child neglect" against mom.  Same if living with dad is unsafe for you.   If, however, you just don't like dad's rules and that's why you're objecting then, I'm sorry to say, parents do have the right to make appropriate rules for their teenagers and teenagers are expected to abide their parents rules.   Good luck to you.