Repentance

its a noun which has two meanings:
1. deep sorrow, compunction, or contrition for a past sin, wrongdoing, or the like.
2. regret for any past action.

But what does it mean in life application?

I thought if you have deep sorrow, it is enough. You are in repentance.

WRONG!

Imagine: You punched your friend. While saying sorry, you are still punching him/her.

Is this repentance? No.

When we are truly sorry, we'll stop punching the friend and change our behaviour. We'd be nice to that friend and not punch him/her.

The punching could be something that we are "sinning".

How can we be "sinning" and say sorry to God? I think it is not possible.

I had this sudden realization that you are truly wanting to repent only when you're determined to stop sinning because you deeply regret what you've done and feeling deep sorrow.