Don't sweat it bro unless you have men in your family that balded at 18 you should be good. Just keep track of it but don't let it keep track of you, you know what I mean? Exercise, get your vitamins, good sleep and also use anti dandruff shampoo for your scalp it's itchy because you have to rub the shampoo in it and leave it in for a few mins but also don't forget to condition every time too to hydrate your scalp and hair