Stupid People At My School

Three things: One, I don't believe in Astrology. My friend does. He called me closed minded because I have a different opinion than him. The fact that I have a different opinion than him doesn't make me closed minded. It just means I disagree with him. And, two, a boy in a different class knocked over my backpack and didn't say sorry or nothing, he just walked away. So, naturally, that made me a little angry. So this other guy decided to bother me about it. This is how it went: Him:"Why are you so miserable all the time?" Me:"I'm not miserable." Him:"Yes you are." He then proceeded to argue the point with me, making me more angry and then, after several minutes I yelled at him to stop arguing me and he replied "Ha! See? You are miserable." to which I responded "This is not me being miserable, this is me being angry because you're annoying me while I'm trying to do my work." And, three, me being stupid, I saw a ten dollar bill on the floor at school and I didn't stop to pick it up.