Is it normal that every waking moment feels like i am half asleep

Well, By lack of a better title that is. I just find myself not interested in anything. I am not depressed nor am I happy. it just feels like I am forever trapped in that moment that you have right you fall asleep when every bit of emotion just seems to evaporate and you just feel relaxed and well. The problem here is that I am not relaxed nor stressed. not worried nor satisfied with my situation. I am just... nothing I guess (and I don't mean that in a depressed way) Last week I slashed the tires of a random bycicle because people always say that it makes you feel alive to to something "Illegal" I did not get any feeling of enjoyment out of it though. I tried shoplifting a few times and that worked for a little while, I feel awake and well when I walk past the security gates with stuff in my pockets but as soon as I pass them my emotional status goes right back to zero. I have a girlfriend that I spend a lot of time with, we hang out watch movies go out to eat and have a healthy sex life but none of that makes me feel really "Alive" I wasn't always like this though, that is why I know what I am missing and its just annoying to feel like I am missing out. It also makes it almost impossible for me to feel empathic. I always imagine that I can watch my best friend break his neck and not even blink. I dont really know if I am just a complainer or if its normal and all that stuff about "Feelings" are just made belief and ranbow flavoured bullshit inspired by things like disney. I just want to know if its normal.