I'm 18yrs of age I be having shortness of breath through out the day where it feel like I don't have no oxygen and I worry because I think ima stop

Anxiety. Your symptoms can be caused by anxiety among other things. Are you stressed out? Or, do you have a fever, cough, phlegm, loss of appetite? Do you smoke? (please don't!) you'd feel better if you had a chest x-ray and knew it was normal. If you can see a family doctor, it would be a good idea - just for peace of mind. Good luck!