Cant feel lately

I'm going through the motions. I play video games, I read, I draw, and I joke around because it's what I've always done but I dont feel it. I can handle it when I'm focused on a task, when I'm busy and not thinking about it, but when I sit down or relax for a minute I just feel empty and cold inside. Maybe it's just a faze or maybe it's because I've been super stressed for the last three months but none the less I thought I might ask what this is. It's not like I feel sad, because I dont feel that eather. At least not that much. I told my dad and he said its eather my 14 year old hormones or that I need a hobby. I just thought I'd ask for any clarification anyone might have