Is this an enjoyable hobby that can keep my mind at ease? I really

You are referring to two different hobbies in your post. Papercraft is not origami, and vice versa.

If you want to start papercraft, just choose a simple looking model and try it out (like a 1 or 2 sheeter). If you can't do it, just choose something simpler. If it is too easy, choose something harder.

For origami, either start with a website like
http://en.origami-club.com/
or look up books by John Montroll whom most of the people on here started out on (including myself).