There are two ways to feel happy:

1. Distraction
2. Fulfillment

Distraction is doing things like playing video games, reading (including reddit, books, blogs, magazines, whatever), watching TV, going to a sports game, or any other form of entertainment. Yes, some forms of entertainment are more rewarding or stimulating than others, but they're all just a distraction. Distraction is a good thing, in moderation. But if all your happiness comes from this, then you will be unfulfilled and will not love yourself.

Fulfillment is a much more rewarding form of happiness. Fulfillment comes from doing things. Building something, making something, achieving something -- anything that takes perseverance and creativity to complete will make you much happier than something that simply entertains you.

All that said, here's how to love yourself: explore your hobbies that lead to fulfillment, and spend your time doing those. Then you'll be proud of yourself that you did something (this comes naturally) instead of embarrassed that you blew the whole day watching TV or whatever.

Then you'll love yourself