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Nope. Never had a problem with that.
My girlfriend is much shorter than I am. The only thing we really have any problems with as a result is that it can be hard to get a picture taken together. Either she needs to stand on something or I need to bend down or something to get our faces closer together.
To kiss standing up I need to lean down and she needs to stretch up but it's manageable. Other than that we really don't have any problem with anything because of our height difference.