How can I succumb to the need to write, with nothing at all to say?

I just spent two hours in an awful marching band warm up in the pouring rain. I experienced sadness, thrill, accomplishment and a torrential down-pour. I'm now happily sitting in warm dry clothes at my desk and I simply have the urge and the need to write. I'm not sure why this feeling has just come upon mte, but its here. Today was a simple school day. It was long and boring. We went to the football game. It was senior night so we watched each of our seniors be introduced. They listed each activity they were involved in. These lists were quite extensive... We then sat in the rain played some pep tunes. Athalf time, I got to play the clarinet solo due to illness in my secition (yes, the swine has infected the clarinets). I was so excited and I got it right this time! It was quite exhilerating. We were given the choice to leave or stay at the game. Our director didn't want us to get sick. Many people left, my group of friends were mostly invited to go get ice cream. Each of them were invited in front of me... I'm sure that I wasn't purposely left out. Just, unthought of? I don't know I'm probably just over reacting, but it seems that when my friends hang out with some of the seniors they know, I'm forgotten... I know they still love me and are still the greatest friends I could ask for. Its just frustrating. Its like I'm the toy they used to play with but I'm no longer fun. They've found better toys to play with and I'm just left in the bottom of the toy bin...Forgotten. I hate to leave you with this depressing thought but I have no positive ones to drive it out... I appologize.