Let me tell you how I handle this. Simply acknowledge the presence of the distraction and then push it aside. Never resist or struggle, that only serves to take you out of the relaxed state. Whatever distraction comes up for you, just let it be and go back to focusing on your breathing. There are a multitude of reasons for why one meditates but they all come down to one simple fact.
Meditation is a way to gain insight and awareness.
It is impossible to meditate wrong, so you cannot fail. Don't sit upright with your legs crossed like a pretzel if you don't want to. Whatever is your place of comfort is where you should be. That will certainly defeat your purpose for meditating. Remember it is about relaxing and calming the mind.