AndStatus does support Mastodon, but I don't think I quite like its layout. I have been using Twidere, if not much, and it is also available on FDroid with support for Mastodon/GNUSocial - even if development is focused on Twitter, it works very well.
Dude, look... you don't need to be on .social to be on the network.
There are other servers that take up users, I would suggest going to those
And being on a different server doesn't mean you can't engage in conversations. The Fedverse is build with that in mind (conversing over two different servers).