Relationship advice needed before its too late

Hi,I'm dating this lovely woman for the past year and a half. I am 38 and she is 36 years old, so we're not exactly teenagers. The relationship never really took off in my mind because I just didnt feel into her as much as I would have liked. She is dark haired so her appearance is along the lines of what I look for in a woman but there are some physical aspects about her Im just not comfortable with, I know this sounds terribly shallow but the way I see it is if I'm to commit to someone for the long term (and possibly a lifetime), I would need to feel attracted physically. That said, we have somehow managed to hang in for a year and a half now and I believe its her personality moreso that has kept me in the relationship than physical attraction. The second issue is that she has expressed a desire to eventually have children, something I've never known if I wanted or not and as time has went on I just keep pushing this issue out into the future as something not to be concerned about for now. I look around at most people I know at my age and they are either married with kids or at least in a good relationship it would seem. She knows Im undecided about kids and has been very patient about this up to now. The real problem haunting me for the last year is do I stay or so I go. Its been a very stressful time for both of us cos I just cant make up my mind and this has a knock on affect on our relationship. Your advise would be much appreciated. Thank you.

she wants kids what do you want,if both of you dont want the same things its better not to waste each others time