I miss my girlfriend?

We've been together for 5 months and she recently moved, right now she is in camp so theres no cell phones, but we write eachother letters. Im 16, as is she. Obviously I would talk to my friends and stuff about how hard its gonna be and how i am not looking forward to it at ALL, but THEY ALL said "Dont worry the first few days will be tough but you'll get over it soon enough" Its been 2 weeks and every day i think about her, im still really sad and its still really hard and really stressful for me. If i'm not keeping my mind busy im always on the brink of crying, I don't want to feel like this anymore, but i dont want to stop missing her. All i want is to see her, I know they say that teenagers can't be in love bur what do you think? I hate to sound like a wuss haha, but it's just really hard and i need somewhere to vent. I'll see her in exactly 22 days and thats the only thing keeping me from being completely depressed, I guess basically what im asking is, is it normal for a TEEN to feel this way even after her being gone for more than two full weeks?