Justin,
I agree with Logan. For being put on-the-spot and asked to perform for a group I think you did a good job.

This is one of the methods Toast Masters uses to sharpen a persons public speaking skill. The leader of the class will put one of the members on the spot and ask them to talk about a subject. At first it is an exercise the new members hate. After a few sessions the new member notices that it becomes easier and faster to focus on creating a speech on-the-fly.

I would encourage you to do more of this.

~John