Re: Humility or inferiority complex?
Of course you should be proud, why not?
But I would also consider something else. If you often find yourself feeling like your Aikido is very good, then it's very possible and even rather likely that you're not training very regularly with people who are far better than you, or in situations where you're being pushed to stretch yourself and do things that you find quite hard. If you're most often in situations where you feel like you're really good, then it's possible you're in situations where you're not actually going to get much better.
I.e., if you can, find some classes and situations where you're below average rather than where you're at the top of the class. You will be amazed at how much you learn!