Chances are, if you see somebody you want to approach, you are probably thinking of what to say, whether you should approach and you will end up staring at her or him for a very long time until it is too late and then you end up not approaching at all. When it comes to approaching, to stop thinking, planning or analyzing your chances of success and failure. You need to just do it.
1. They are not rejecting you, they are rejecting your approach
2. Don't give a fuck.
3. Just do it. Act first, think later.
4. Act first, think later. Three second rule.
5. Your chance to be somebody else and the next day, no one will even remember or care.