Hi! Long time no speak! How are y-- oh, wait, what's that? 6 months have passed and you're still moping and self-centered about this whole thing?
Advice?
You're not being realistic. You're assuming far too much. You have no real concept of love, of wanting to spend time with another person, of, as ville said, respecting their oddities.
There is no guarentee that anything you say is true, or bound to happen. No guarentee! You set up these unoccurred scenarios to excuse your feeble attempts. You've created these imaginary, not-yet-happened instances that roll through your mind like a movie trailer each time you ponder a girl for long enough -- "coming soon! He has a month to save the world from a lack of knowledge, She has to put up with it. He is ashamed of what his whole life revolves around and she is therefore ashamed of him too. What is she thinking? Why is she with a... *shudder* gamer?!"
etcetcetc.
You need to check out this crazy theory called empiricism. It's where you need this thing called evidence, which tends to be gathered first-hand, to, like, prove something?
Basically, if a girl is lame enough to not understand your needs, to not acknowledge that you have a job that requires specific things in order for you to buy her pretty things, then she is not interested in you for you, she is interested in you for the sake of having a boyfriend.
What if she's a pilot? She goes away at least two or three times a month, for 3-5 days at a time? Is that going to lead to you walking out? You can't know the answer to this. There'd be other factors. If she was a bitch when she was around, then yeah, totally. If all she did was whine about shit, then yeah, totes. Dump that shit. But if she spends her every spare moment with you in a caring, funny, relaxed, loving way - then why end the relationship?
Stop being so ashamed. Stop thinking you have all the answers. Honestly, it's a little sad to come back 6 months later to see you've finally gotten round to dating sites, something we all said you should do over a year ago. You disrespected our opinion the entire time, shunned the success stories we all presented to you because of what? Your opinion.
Shh.
A girl with little interest in gaming will not spell the end. If you have little interest in shoes, make-up, shopping, 50 shades of grey/magic mike/twilight/formula 1/tennis/country music and yet she likes these things, does that mean it's over?
(well to be fair, twilight? I mean, jeez...)
Bottom line:
You have no experience of relationships so don't bother imagining what it'd be like, and don't let those imaginations stop anything from happening. Don't make up these stupid excuses.