Should I have a baby or wait??

Had my son when I was 17 and husband 22. Now we are 21 and 27 and I really want a baby but then I don't. My debate is always that I'm young and feel as if I'm just having fun in life, I just started college, and everything is so easy but at the same time my son is asking for a sibling and I would love for my kids to be close. I also loved being pregnant so I'm looking froward to that. Should