Don't make anyone your 'entire life'. You only got one and it is your's, not her's...
This sounds pretty normal to me? With age you expect a degree of maturity and wisdom. If you've spent time with women and had relationships your views on things will change with experience. Same as you when I was younger I had 'crushes', most people do and many still have them to an extant in their adult life it is fairly normal. The guys that are trying to focus solely on their girl are likely trying to fill a void they have with a person, they need to fix that void by their own accord. The woman should be a compliment to your life that brings value and you should be the same to her. Anyone that makes someone 'their world' is destined for a downward spiral of pain and regret in the future.
You know where your focus wants to be
Don't allow others relationship dynamics influence yours, especially in your late 20s as you start seeing everyone get married off. As for the notion of that deep rooted affection I think that is just human nature and some have that quality more than others. Got hurt enough to where I don't really feel that way anymore, but I know under the right circumstances it can show through. A lot of guys love too much and get burned for it, so they often learn to tone it back and eventually adjust to that state of being and normalize it. In other words change the mental schema.... and now we've more or less delved into the Red Pill.
I think with age 'game' can be acquired and perfected, but I do not think it comes on its own in the slightest. There are plenty of guys far older than I (most) who have no clue about game.You have to either seek it out or recognize it on your own. I fit more of the 'natural' category and was completely unaware of it up until the past few years. A lot of guys never realize their innate potential because they don't recognize the things before them and live in ignorance. You are aware and wiser in my eyes, and as result you get this dissonance and self doubt since you are seeing others around you doing things which oppose your own mental framework.