and swimming are usually open to all who are willing to come, so no pressure for try outs or making a team.

As someone who grew up heavily involved in theatre, I would urge caution as that group tends to attract a type that feeds and thrives off a culture of depression. It isn't often a healthy group. Sports have their problems and issues too, but not nearly the same.

Although getting involved in something is better than nothing, and is important to make friends.