Sensitivity

It may just be my period making me really sensitive but I feel really weird every time I think of my boyfriend. I get really sad because I'm not sleeping next to him or just with him completely. I see him when I can but I've been really busy and even when I do see him it's only for hours at a time. Im only 17 but I feel very serious about him. I just wish I could be with him more. I even get really lonely at night and have to sleep with my body pillow because of it. I don't know why I'm feeling like this. Any suggestions/explanations would be cool, if not, that's okay I kind of just needed to get it off my chest.