Friends who make you laugh at yourself without making you the joke are rare. Keep those.

There is a difference between being teased and being used for material. One leaves you lighter about your own flaws; the other leaves you deciding not to mention them again. The good version only works when the person clearly likes you, and you can feel that difference before you can explain it.

Think about who you are around when you can admit something embarrassing and still feel fine. Tell one of those people you are glad they are around, even if it comes out awkward. Then check what your own jokes do to the people hearing them.