Ask HN: Time to change my job?

I work at a startup in SF, and it's been almost three years. I like this company and like what I'm doing but my manager often makes me frustrated.

Reasons: - He has some temper, whenever I do mistake often yells at me saying 'why is that', instead he could give me clear reason that what I've done is wrong where I can learn in positive way. He is very talented but his management just don't fit to me. - Often IM me in the middle of the night or weekend for job request. - Not fun at all, all he does is work so nothing to talk about + doesn't drink beer or coffee at all.

I'm trying to stay till this Winter for stock options but these kind of frustration happens too often, makes me want to quit.

This is my first job, so I don't have experience quitting or changing my job.