If it's not him pressuring you, then that's a good thing.
I think if you're worried about your family's feelings towards any big decisions you make with regard to your own life and intimate family unit (your partner and any kids you may have), that suggests to me that you aren't decided about what you want to do, yourself.
If you really wanted kids right now, it wouldn't matter what anyone thought. You are not that young. 23 is ok. Back in "the day", 23 was OLD to be a first time mother! I know times have changed, but generally people's feelings remain much the same. If you want a baby, you want a baby, you know?
In terms of being ready or not, it's fine to tell your boyfriend you just want to wait a bit...to REALLY get that urge to have a baby. THEN you will jump in 100% and be happy and secure in your big life choices.
It's also ok to tell him that it's important to you to be married before having a baby, or even trying for a baby. If that is what is a priority for you, then you must be honest.
If you aren't really interested in getting married, you must discuss this too.
I don't think any of these things are huge problems. If you love your boyfriend and want to get married, then that's excellent that he's intending to propose. It's all good!
If you want to have a baby but not necessarily right now, that's fine too. I'm sure your boyfriend will be fine with it.
If you are secure and confident in your own decisions, your family's opinion (if negative, which it may not even be) will not be such a big fearful thing for you to confront. And for them, if they see you are fully decided and commited to your decision, they will also find it easier to accept that it's right for you, and thus be happy about it.