Am I too guai?

Geez, many of those that just known me always said I'm too 'guai' (good boy).
Just when I told them I never land my feets at pubs and disco.

I feel that I had a bad man look, fierce , stern and may look a bit well... "evil".^ ^;

But oh well, I will clarify about myself, I'm a serious worker, sometimes may seem to be a perfectionist, I'm quite slow at getting jokes, some called it slow reaction, and I am a stupid boy when you ask me all about some general knowledge questions.

So what's wrong with not noticing the bad-ness of people by not going to pubs etc?
Frankly, I don't understand it, maybe when people said that they mean I'm not socialising well enough?

Hope to be enlightened,
zhaoru.

PS: I hate crowds. Silence please! >_<