Weird dreams

So every once in awhile I will have a really weird dream about some guy that I fall in love with. I wake up and I'm literally sad and heartbroken for a few minutes. I'm 15 and people are always asking if I have a boyfriend and I've never had one. I'm not looking for a boyfriend and I'm not necessarily refusing to have one?  I don't know if these dreams mean that I am secretly wanting one and that deep down I'm somewhat sad about not having one. All of my friends have had boyfriends and I never really cared if I had one as well. I mainly try to focus on school and my music, not boys. But I'm still confused as to why I'm legitimetly sad after these dreams.  I think my heart wants love and my brain wants education ?