Confused.

Is it normal to like two people at the same time but being in the relationship with the person you like more?

How do you know you like someone? How would you explain how it feels to someone who doesn't know what like is?

Note: the person i'm in a relatioship with is freaking amazing. And the person that i might like(cuz IDK) is the first person i ever liked.

And sometimes i feel that being in a relationship is nice but then other days i wake up and feel like i might be better off. Because of my indecisiveness, habit of making literally everything complicated and forming a lot of questions regarding one simple thing, i feel like my bf might be better off without me. He is such an amazing guy and im just ugh.