Had myself fooled

Am I nice? I've been pondering this question all week long. I've been a foul mood all week and every morning I get up with a smile and by the end of the day some shit head has done something to piss me off. What really got me going was when I was in the ladies room and I was walking out as an older lady was walking in. I smiled (as I do to all strangers) and she just shot me this go to hell look back. That really miffed me because I am so conscience of my actions and how I come off to people and she just threw my smile in the toilet. So I got back to the bookstore and asked Kristian and Aimee if they thought I was nice. They both said "yeah, of course we think you're nice" and I said "no, give it to me straight" and they reassured me again. Now, Kristian I've know for a long time and Aime is may have been just being nice but I know her well enough that if she didn't like me I'd know about it. So, reassured, I get home and I ask Chad the same thing, am I nice? Without even blinking he says "no" and I was flabbergasted. "what? Are you saying I'm not nice?" and he said "yes" and I asked "well, am I mean? What do you mean I am not nice?" and "well, you're not mean, you're just not nice." I was not offended or even angry, just shocked and we had a good laugh about it. He went on to tell me that I'd have more friends if I was nicer and would get over my trust issues with friends. He told me to go see a counselor. I'm laughing even as I type this cause all this time I've been walking around like 'hey, I'm the nicest girl ever' but apparently not so much! So now I want to know what you think. Give it to me straight. I can take it.