I think I lie on instinct
Have you thought about trying to change that?
I think about that all the time
I would be more than happy to try to help you change your lying ways. It's not good to lie to other people, and there are lots of strategies you can use to be more honest.
I don't want to do it. I'm tired of focusing on changing. It's not up to you.
Well, you're right that I can't decide for you, because it is up to you whether you will change or not.  However, I must emphasize that continually lying to others will have grave consequences for you later on.  If you are not interested in changing for the sake of honesty, at least do so to avoid problems.