Y do i miss him so much?

I am in a long distance relationship with a guy and we're on two different continents,6hrs away..its been three weeks and i miss him sooooooooooooooooooooooooooooooooooooooo bad...i cry everytime i remember him an think about the situation... he doesn't have an email an we talk like once or twice a week..i'm only 15...i know e loves and miss me 2...i am tired of the pain and missing him,i wanna break it of but he's my first love.we've been through so much for the 1 and a half years together and i don't wanna lose him..he doesn't want to let go either... i'm so stressed out and i don't trust him.