Genesis 2:18:

"The LORD God said,
"It is not good for the man to be alone.
I will make a helper suitable for him."

When The Lord God said that, it was in reference to Adam.
Adam, who was alone.
Literally.
There were no other people.
The population was 1.

Today, none of us are "alone". 

1 Corinthians 7 says:

"Now to the unmarried and the widows I say:
It is good for them to stay unmarried, as I am.
But if they cannot control themselves, they should marry,
for it is better to marry than to burn with passion."

"Are you unmarried? Do not look for a wife."

"An unmarried woman or virgin is concerned about the Lord's affairs:
Her aim is to be devoted to the Lord in both body and spirit.
But a married woman is concerned about the affairs of this world—
how she can please her husband."

So is marriage wrong? Absolutely not.
But it also not "required".

"But if you do marry, you have not sinned;
and if a virgin marries, she has not sinned.
But those who marry will face many troubles in this life,
and I want to spare you this."

Whether or not the Lord has planned for my 18-yr old to marry remains to be seen.