Depends on wether baldness runs in your familly. Is your father or maternal grand father bald. Most people reach the stage of norwood two at some point in there life its nothing to worry about and isnt even classed as balding.
Yes, check with a dermatologists. And also, your male hormones are telling to act like the man that you are. Be physically active as often as you can and don't sit around too long. That'll will help maintain your hairline.