The OP wrote “I think what bachurim sometimes do/don’t do doesn’t always reflect on who they really are and want to be”
So if the things you’ve done are truly in the past, you can often let them stay there.
It sounds to me, though, like you are referring to things bachurim sometimes do, knowing its not really right, and assume things will change once they marry. There’s the problem.
Habits die hard, and marriage is not a hospital. If you currently do not act in the way you portray yourself, forget about fooling her – you are very possibly fooling yourself.