You are still young enough to partner up with someone who doesn’t have children. However, as you don’t want children yourself, you will naturally be looking for a man who doesn’t want children or can’t have children of his own... I don’t know how easy that is but they are out there.
You don’t have to be a ‘Step-Mum’, just because you are in a relationship with a guy who has children. You are the girlfriend to a man who has a child. However, if the guy you are with expects you to be a step parent to his child then this is where conflict could arise. I would suggest that you have a very clear and comprehensive conversation with your boyfriend and ask him about his expectations of you with regards to his son. I would also suggest that you lay down your expectations of him with regards to you in the dynamic of his son.
For example:
Are you willing and is he expecting for you to become the full-time maid, cleaner and cook to himself and his son should you live together?
If his son doesn’t like you or take to you, how is your BF going to handle it? How are you going to handle it? How will he expect you to handle it? Will it mean the end of your relationship?
If his ex (the mother of his son) decides to launch an ongoing war against you, him or both of you (yes I’m afraid this is very common), how is he going to handle that? How does he expect you to handle that? Will he put his foot down and stick up for you? Will he align himself with you and seek out legal representation in a situation where libel, slander and/or defamation of character is occurring?
If his son should begin to like you but then change his mind and start to not come on visits or his mother withholds the son from him... how will your boyfriend handle that? How does he expect you to handle it? Will you be left out of these gatherings/visits? Will he go to court and fight for his son?
If his son should start to become rude, aggressive or abusive towards you, how will your boyfriend handle that? How does he expect you to handle it? What would he do to implement acceptable house and behaviour rules?
This all sounds a deeply unromantic conversation to have with a guy who you are only recently dating. Trust me, go there with him and ask him all these questions and more, because it is probably the single most important conversation you will ever have with him! I mean that sincerely. Please do not allow him to fob you off with ‘it won’t happen’, ‘everything will be ok’ or ‘this is all a bit pessimistic’ or anything that does not give you a clear idea of how complicated or less than ideal situations will be handled by both of you. You do need to know what his expectations are and he needs to tell you what they are.
I think the majority of us who are or have been SMs and didn’t have these conversations with our partners before we stepped into SM shoes, wish we had! I mean that too sincerely.
If you choose to be a SM, any one or a few of the situations I have outlined above can and may happen. They are common. So if they should, you will already know what stance you are to take and what stance he is willing to take.
In my personal experience, boys are easier than girls if you are a Step Mum, but I know that not all SMs have found this.
Good luck