If you feel cramped with being with him 24/7, it means you are not ready for a 24/7 commitment to him. Nothing wrong with that at your age; you should be exploring all options in your life before making a commitment. Doesn't mean you need to break off with him. Does mean he should be giving you some space so you don't feel cramped, and if he is unwilling to do that it is time to run because it is a warning sign of a controlling, potentially abusive relationship. If there truly is something between you, giving each other some space will only solidify those feelings and help you make up your mind.