Because they cannot understand anyone differing from norms expected by society.
Take your time. Ignore those people. Never rush into marriage or some relationship with a man you barely know. It is not worth it at all.
I used to have a friend who did the same. When she got a boyfriend, she hounded me about getting one. When she married him, she hounded me about getting married. When finally I did get married, and she had had a baby, she hounded me about having a baby. My perception, be it right or wrong. was that if I made the same choices she did, then that would validate her choices.
They just think you'd be good is all. Just an opinion. They're allowed to have one same as you.
Lol. Only you would know best. =)