Is it normal i don't give a fuck about almost anything except what i like to do

I sometimes feel that I don't do enough effort to obtain something and when I do it's the less possible. It's like I really economise my energy. However, when I have to do something I like I give all my enthusiasm and strenght.
I'm like the cool guy that don't talk very much and just focus on the things that finds important. People often blames me on that and I don't really care haha..
The thing is sometimes I tend to miss some opportunities and regret about it later (usually for about 2 minutes then I return to my Idontgiveafuck loop). For example, there is a lot of girls in my school that have a crush on me (like they look at me all the fucking time!)(and some are really hot! haha) but I'm just to lazy to gather all that will and take an initiative. I know i'm able to take a step just I don't know if im doing things right and so I return to this sort of daydreaming haha