I will never be able to have children, although I wish with all of my heart that I could. How many times it has crossed my mind! I don't know what it is like to be a parent and I can't fathom the love a parent must feel towards their child(ren), but I imagine there is nothing like it on earth. I have a nephew who is 4 years old and I love him more than anyone I have ever met, even my own parents. That gives me a glimpse, but only a glimpse.
Parenthood can be an immense blessing, but I know that it can also be a very heavy cross. I don't know if everyone who is married is called to carry that cross. Maybe they are. How can one say with any amount of confidence? And even so, how can we as sinners sit in judgment of another? God alone knows the hearts of men. If you ask the question for personal reasons, then I think it is more important to go to the Lord in prayer and to seek out spiritual counsel from someone with wisdom and discernment instead of seeking out the opinions of those who lack the spiritual maturity to assist you. If you are asking out of curiosity I strongly encourage you to move away from such things as they are spiritually dangerous. Forgive me.