I think it all comes down to shame and putting up appearances.
If I don't feel shame, and if I don't feel the need to put up appearances so that I can feel good about myself, I'm left just trying to do the things that I want to do, for my own reasons.
As soon as I realized how driven by shame and putting up appearances I've been, it hit me that if I stopped doing that, I would have a tremendous amount of time on my hands. And I'd have a lot of flexibility, because there just isn't that much stuff I genuinely want.
However, when pursuing my own interests, I'm liable to act selfishly and immorally. That's just what comes naturally.
One thing: I'm not a good liar. When I've lied well in the past, it required deceiving myself. The less I delude myself, the harder it is to lie.
I think the key is to become comfortable with shame and with perceiving of myself as a "bad" person. To the extent I can do that, I seem to just act selfishly and without conscience.