Why does it work like this?

I have found lately that a lot of people go out of my life mad at me. I work very hard at my job, school, & learning my trade. I am a young man. I have little time. I go out and party. This has mostly been happening with my room mates. I have lived with 5 women over the last year and a half. I find that I'm usually the jerk. We are all in our twenties. I tell them that I want them to be happy. I am happy although I get sad, I have an outlet through learning, playing music & going to school. I see life as a ping moment and I need to take advantage of it. I know it will be gone before I know it. And I don't believe in getting all uptight about the little things but it really seems to piss people off that I will shrug things off. My roommate/best friend just told me tonight that I act like I have everything together and I talk to them in a condescending manner when I don't have everything together. But I have chosen to be happy and it seems like some people around me aren't happy and I want them to be happy but if I tell them that then they say I'm talking down to them. It makes me sad, but I truely believe that when you die you die alone. There is nothing else. Then you will have to be honest with yourself, and we waste a bunch of time playing games as young american adults. We worry about being cool or fitting into the herd. That makes me sad, actually, but I still persist towards my goals and expect tomorrow may never come. All we have is this moment. All we have is what's in front of us right now. And for me, that is a computer. You can't make people who you want them to be. I think that is the hardest lesson I am learning in my mid twenties.