My charger cannot insert into my phone

while i was out, i noticed my phone was going to die, so i put it to charge for about 10 minutes and took it out. half an hour later, i decided it would be a good time to leave it to charge again, but the charger wouldn't go in. i then went to try multiple chargers, none of which would go in my phone. i asked a friend and he says there's something stuck in there. i don't know if that's the case because my friend says the charger i used still worked, but i still don't know what's wrong.