Is there a problem with my vocal chords?

from your teens up until your early 20's (that's just a rough estimate it varies from person to person) your voice is going through a very difficult period. your voice is changing and developing into what will be your adult voice. the best thing to do is make sure that you're doing everything right now and get into good practices so you don't do damage to your voice in the future. your voice is most likely not damaged right now, if you're really worried visit a doctor, but you're probably alright. if you're seriously thinking about doing something with singing as a career you should definitely invest in a voice teacher. a good teacher will teach you all of the proper techniques and practices that will make your voice strong, healthy, and long lasting :)