It is really OK that you didn't get into YC. People with absurdly successful companies today had to apply repeatedly to get in. And, of course, getting into YC is just one way to do it.
Gatekeepers bother me a lot too. You can bootstrap instead of appealing for financing, and sublimate your anger at the gatekeepers as motivation. Lots of successful bootstrappers do exactly that. Being pissed off at financiers worked really well for me for a bunch of years.
Ultimately, though: you're responsible for your own success.
Also: next time you bring up your startup in an eye-catching retort to someone lots of people follow on HN religiously, you should seize the opportunity to tell us about your startup. It's 7 years of your work! That's the most interesting thing you have to talk to us about; not "not getting into YC".