Dont have a clue

There has been so much on my plate and going through life right now is so hard. I have feeelings for a person i have known since Highschool. When he left for the military, training that is, i started writing to him. He replied, it was like talking to him again on the phone. we use to do that when he was here, talk on the phone about random stuff...but now we cant, we can only talk through letters. But in one of the letters he wrote to me he admitted his feelings for me and now im troubled....i really like him and he says he likes me....whats my obstacle?? Hes not a christian. It hurts to have feelings for a guy and knowing that your parents wont approve, and now i just feel like giving up on finding the guy that God has for me. But i would have people say to me, DONT GIVE UP, he will come....but im not getting any younger, i wanna marry and have kids for goodness sake, the more i age the harder its gonna be....i really should worry about this but i just dont know. I have been through to much in my life and had to many upsets. im emotional and cant help it, the littlest thing sets me off and i dont know if a guy would even be able to handle my emotional state, cause that comes out often...ugggg what do i do? I really like this guy.