For example I want to learn more history or math. But as soon as I start reading or watching video, I start feeling sleepy. Rather than thinking “Oh may be I was not really interested in them” I’m curious to know your approaches to learning. If there is a better way to learn new stuff and keep at it.
I’ve worked with lots of college students in my time. One thing I recommend to them is to pick classes based on the instructor, not based on the course content (something I wish someone had told me).
A good instructor can make any topic engaging and enjoyable. And people have different preferences for how information is conveyed (for example, I gravitate toward instructors that use diagrams and other visual aids, it works best for me). So look around until you find someone that really clicks with you.
The other thing that works for me is having some sort of end goal. I find it easier to stay engaged when I get to do something meaningful with what I’m learning.
Out of curiosity, why do you want to learn more about these topics? Understanding your motivation might help to figure out something that works for you.