Many new users have noticed that Mastodon is not a 1 to 1 clone of the Twitter experience.
Mastodon ≠ Twitter. It's something else entirely with different cultures and social norms. Mastodon is not a replacement for Twitter, and is not intended to be one. Do not join Mastodon expecting Twitter. Join for the community, and leave the Twitter behaviors behind at Twitter.
There is also the rest of the Fediverse too! Give them a look at https://fediverse.party ?