Legit or Fluke?

For the past month, I've been thinking hard about my future. I goto college and take 4 classes. Something that keeps popping in my mind is having a family, getting married, having a baby. Keep in mind I'm 19, I'll be 20 this year. I wouldn't mind getting married and having a baby when I'm 20-22. But I keep telling myself " no not this year, focus on school so you can do your dream job and can set up a college fund for the kids you want one day." Which is pretty smart if I say. But I don't know If i want to be married and have a baby because I'm having a really early mid life crisis or if I want one because I Genuinely want this in my nearest future. I'm Trying To Hold Off till I'm 24-25. But, the thought reoccurs frequently. Any words of friendly advice please.