The joke made at your own expense should still leave you something intact to return to.

Self-deprecation is a useful social tool that can quietly become a habit of demolition. A joke that gets the room on side is fine when there is a version of you it does not touch, and less fine when the laugh depends on agreeing with the worst thing you think about yourself. The difference is whether you can stop and still be standing somewhere.

Notice which of your jokes you make automatically and what they are all about. If the same weak point is being offered up every time, try leaving it out for a week. Whatever fills the gap will tell you something worth knowing.