I used the webapp version to browse, never registered. I find seeing photos of others, makes me jealous and self conscious, not saying bad about myself, just that I feel jealous of what features others have. Not healthy mindset for sure. I like it, more conversation focused, not "look what I have". Congrats to mastodon for being better community wise over fb or twitter.
The particular instance you are in may be a factor in the posts you see. It's the same as Lemmy, you can be on Lemmy.ml, or Lemmygrad, or Lemmy.world and the posts you see may change. It may be better to find an instance that works for your interests.