Once again depends on the context. There's ways you can objectify yourself that are harmful towards others or unhealthy and ways you can do it which aren't those things and are cool and good. Like, bodily shame is in part a form of self objectification in some circumstances, like after internalising misogyny for instance, you begin to treat your body like it's just something to be appraised or exchanged and care more about its value than you yourself and your needs. Essentially self-objectification is the internalisation of objectification and it can exhibit all the issues of objectification, including accidental promotion of bog standard objectification when it is externalised. But there can be cases of utilising one's body for empowerment purposes which are cool and good, and there can be cases of kinks that revolve around self-objectification which can be cool if done safely.

Also chasers have been using this word forever idk what to tell you.