Well, I think it's 100% fine if you want to be better for yourself provided you utilize at least some percent for the betterment of the others, or you can completely sacrifice yourself for the service of mankind, it's upto you, but wanting to be successful is not bad at all.
I follow my notion that whatever I truly desire is what God wants me to go towards, and base my actions accordingly.
Truth comes with it, as if you can't speak truly about what you did or what you doing then it's not the action I should be doing.