No social media, or only professional use of it, preferably. That would cut off about 50% of your privacy worries 🤣
If you want to keep social media, keep the information shared to the minimum, and if your friends want more details, they can DM you. Trip pictures/party pictures AFTER the fact.
No medical details in conversation and social media (this should stay personal), some people do use those as supplement for terrible conversation skills... It just brings in bad vibes and closes the conversation since the opportunities to change the topic become rarer. Also I'm sure you've known that grand aunt that only talks about her Parkinson's and nothing else... Don't be that kinda person.
No children on social media (it is for their protection too, rapists and pedophiles are abundant out there and do use social media to seek for their next target.) Only share photos with family that you DO trust. Dangerous ppl can be within your family too.
You CAN talk about dreams, plans, goals, but you shouldn't talk about the current glowup process you're going through. Two reasons to that: 1-Youre exposing yourself too raw by sharing your vulnerabilities and 2-Youre adding yourself extra pressure to acheive in a process that is not linear. You are pressuring yourself to acheive the glowup asap because you did share about it and fear to let down those people. Do not share about your current ongoing glowup/plans you're doing.
You can take a listening position and become the interviewer instead of the interviewee. This will relieve a lot of pressure from staying private, and people LOVE being listened to. Ask questions, questions, answer a bit so the other doesn't feels constantly asked stuff, then ask questions.
Deeply personal secrets should be shared with the therapist. Once the secret is kinda broken, it feels less hard to not share it. It doesn't stops you from sharing a bit of this with your best friends or your partner, but make sure that you'd be fine with it being leaked.
There's a limit to being too private too, because if you're too private people might forget you or think you want private space. Don't stop yourself from going to people, socializing, being human.