I can't take it I need advice!?

I went to Syria in Gr. 9 for the first time ever and I met the guy that wants my hand in marriage (my cousin 3 years older then me ; ps I don't mind because culture and Islam are more important to me and no it is not true kids will be born defective because studies show that the chances are very insignificant ), my parents said yes only when I get older if a man has still not approaced my parents, obviously my parents want me to get married to the best guy possible so if I got engaged that time then I would have not been given the chance to meet other good men. I am now going to Gr. 12 and I think the feeling was always there but I was never fully able to know, but I really really do miss him, I can't help it. During the time I was in Syria, he was always very kind and respectful I remember one time I was really upset and all he wanted to do was cheer me up, when I was leaving Syria I was crying because I was going to miss everyone and he was right there faking that everything will be fine , making jokes in attempt to cheer me up. It's been so long and I still have to wait longer and I will not be going till Ramadan and Eid are during the summer by then I will be done first year university. I need advice I don't know how much longer I can take this I feel empty I'm afraid that during this time he may find someone else if that happens I don't know what I will do I really can't see myself being a wife to anyone else.