Don't worry, one get used to it. It doesn't even bother me any longer - I find it a nice relaxation (okay, I don't know if that word exists in english) to be out in the stable mucking out and fixing about. It's the riding (ergo the fun part) that takes time though. Mmm.. will go riding soon. Training dressage = coming in sweaty all through. But happy. :-D
You need to be tougher! Don't think of the horse weighing 10 times more than you, if you believe you are stronger the horse often believes in you. And one have to be unbelievable stubborn. Repeat and repeat and repeat. Sooner or later the horse will understand that he better do what you want because you will keep trying until he gives up so he better do it at once. :-D They are worse than donkeys most of the time.

hugs