<human>: I have been living with my gf for almost 2 years now and dating for almost 3. It's about time to get married and I have already started saving up for a ring. The problem I seem to be having is this: 
I go through waves of certainty.

I know she will be a great wife and the best mother in the world. We get along and like to do the same things. Most of the time I know it would be a good match and we would be happy and not get divorced. 

Other times I feel like I need to make an exit strategy. What drives me nuts is I think it may only be for superficial reasons. It's like a part of me is just holding out for a better looking version of her even though I find her attractive. 

I think the main reason may be, that since my mom had a failed marriage and her current one seems to be going the same way, my mother has drilled into my head that she wants me to be 100% sure that whomever I marry is the one(since I was about 10, I'm 26 now). Just thinking about that feels like a lot of pressure. I know focusing on the future too much is supposed to cause anxiety and focusing on the past too much causes depression. When I focus on the present I just fluctuate between being so sure and as unsure as possible.

I have been looking into therapy but my occupation has a stigma for guys who do so which may hurt my career which I love.

My gf and I have talked and she has been very supportive of my dragging feet but I don't want to hold her back from finding someone and starting a family (which is what she wants probably more than anything)

Can you provide a brief overview of the text?
<bot>: Is it just my mother's pressure and the crippling fear of divorce? Or am I just nowhere near ready for marriage?