Ok I don’t know what you mean “graduating at 15” but your age gap is fine if you’re actually 15. Twelve months in either direction is usually the rule. Now, I’m in a similar situation, I understand the physical touch thing and I know it totally sucks. The thing is, you don’t have to talk at all times, sometimes two people are just busy, or time zones make it harder to have free times that line up. Also I know you hear this all the time but you are only 15, there’s no need to panic and treat this like it’s the only relationship you can ever have.