Doesn't change the fact that your not loveually mature. The chemicals needed for love haven't been created for gender specifics yet. In laymans terms, you haven't hit puberty yet.
There are always exceptions, and it is possible to feel love when you haven't hit puberty, lol.
If your brain is beginning to hurt it's probably just your nap time. Go take a nappypoo and I'll teach you about puberty when you wake up, okay?
You're only 15, you aren't an adult bro. As far as I know, you aren't mature either.