You'll stop yourself much sooner, and many more times, than anyone or anything else will stop you.
You put yourself down for the slightest of errors. You tell yourself that you don't belong in a particular group or that you are not worthy of certain attention when the people who are in that group and who do get that attention are just as human as you are.
Your idols? Those people you live vicariously through? They have those same negative impulses that pop up from time to time. The difference is, those impulses have no power in their conscious minds. Those idle thoughts never manifest into conscious thought, let along self-limiting actions. Yours play defense against you.
One way you can make yourself more successful, right now on the spot: Stop playing defense against yourself.