No, I do not find your avatar disturbing at all. In fact, the first time I saw it, I literally lol'd. While some may find it "ugly" or not "aesthetically" pleasing, I feel the need to remind everyone that the game that we spend so much of our time on, is set in a dystopian future. It's not supposed to be all sunshine and lollipops around here.
Also, regarding the issue of the younger people who play Disco, in order for them to see this disturbing image in the first place, they first need to join the forums, and I honestly don't think that there are that many 12 year olds sitting around reading forum posts (I could be wrong, but I doubt it). In addition, I assure you that the average 12 year old has intentionally Google searched far more disturbing images than a drawing of a trollface vampire.
And besides, not all of us want to have big eyed anime girls as our "forum face".