I'm barely 5'8" and I never let that stop me, that's cause I made a SPORT of getting rejected. Getting shot down is never a pointless exercise - you ALWAYS learn something and it helps build the tough "I dont give a F*ck" skin that girls naturally are drawn to. At the end of the day, if you don't have the balls to play, then you relinquish any right to complain when you LOSE.
Men initiate, women respond - that's the name of the game so get used to it bro. Yes its true, they notice tall guys first. Yes, there are probably ten guys who are better looking than you at the club - but what you are failing to realize is that 90% of them don't know what to say to women and destroy all that attraction the second they open their stupid mouths.
But when you DO know what to say - when you walk into a set just for laughs, with no attachment whatsoever of the outcome other than fun and experimentation - that already puts you head and shoulders above the tallest dudes in the room.
Making excuses not to play is easy - most guys do it. You need to concentrate on not being most guys, and dealing with this imaginary fear that great harm will come your way if a girl rejects or ignores you. Remember - she's just a girl, and only has as much power over your psyche as you give her.
Of course if you approach her and she sees you looking at buff guys the whole time, don't be surprised if she thinks you playing for the other team
Seriously man, it's time to stop crying about what you cant change and evolve from snowman to snowPLOW - just break through whatever resistance is in your path and nothing will stop you, not rejection, not embarrassment, not the GQ models who are jockeying for the same girl. All that is irrelevant when you are in the right state of mind - direct, driven and MANLY.
Point A = You
Point B = Her
Draw a straight line and connect the dots homey, cause everything else is JUST NOISE.