How to stop girls mocking me for my height?

Hi!
So basically I'm a 5'1 male (18 Y/O) and am constantly mocked for my height. Living in quite a tall area, most girls are 5/6 inches taller than me. I constantly am asked to compare height, shoe size, hand size, leg length. take picture with me etc. You name it, it happens. Recently I've also had a group of girls ask me to put their heels on to see if I was as tall as them (I was 2 inches smaller still) and have had comments like ''Awwh my 12 Year Old sister is taller than you''.
How do I stop this happening? I can't ever be seen in a serious way by girls and they constantly see me as a gimmick.
How to stop girls mocking me for my height?
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