Interesting position you're in.
I would suggest that finding a woman who wants to marry you and whom you like is not a very common thing. It takes time and effort. Its not really something you can just wake up one morning and say "You know, I think I'll got find the love of my life today" and be done by suppertime.
Aviation, on the other hand, will pretty much be there. Not only will aviation be there, I can decide what type of aviating I want to do. Solo, XC, some dual, some glider, some tail-dragger, etc.
Being ready to marry. Oooh boy. Nobody is ever actually ready for marriage (or kids for that matter). The ones with the biggest shock are the ones who think they are. Marriage is something you jump into and you will either sort it out or not. The ones who profess to being ready are usually the ones with the biggest adjustment when they actually engage in it. Just accept that there will rarely be a really 'perfect time' to get married. There is always something that will not be quite right.
You seem to view being married as a negative. Yet, you're overlooking the positives. You'll have somebody in your corner who will encourage you when the days of self-doubt come around. Someone to talk to about the struggles. You will have someone to look forward to coming home to. Someone to share the joys of a promotion, of a new job, etc. There are tons of benefits to marriage (including even in taxes!).
Having kids is great. A lot of work, yes. But a kid to help learn things, to share your interests with, to help them meet their own goals and desires. There is nothing else like it. Very few things in life compare to the range of emotions that kids can bring into your life and some of the most contradictory ones will occur at the same time. (On one hand, you really understand the appeal of child sacrifices; but on the other, it was pretty funny)
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With all that said, what is my advice? Sorry, dude. But that is for you to decide. I just merely want to point out that marriage and kids are not net-negatives at all.
Let us know which way you go with this, we're all curious how it is decided.