It depends person to person. Ya frankly speaking it is the situation where each & everyone gets nervous. It is obvious because we are going to start the new journey of life. At the last it is very crucial part of your life too.
Of course. It is normal to question things. Marriage means forever with the same person (at least it used to) so that is a massive commitment. No one is perfect, so I am sure all the imperfections would play on your mind.