I'm 21 and only just one wisdom tooth came out. The others will came eventually? Can this tooth deform my teeth?

Depends. Do u have the other three? Not everyone gets all 4. They can not deform ur other teeth but they can result in crowding them.
Have them out. Most people's mouths are not big enough for all 32 teeth so we have our wisdom teeth removed. I suspect that the best course of action for you will be to have the other three removed as they come in. You should discuss this with your dentist at your next appointment.