Under "my profile" click on "edit my avatar". There are a bunch of forum supplied avatars to choose from. There is a way to choose one outside of this, but... see if there's one you like there. If not, someone will be able to guide you in the right procedure to do a different one.
(And hoooo boy do I hear you on the teasing and lack of support. My ex used to make the most unimaginably bad "jokes". They really hurt. )