If you don't feel at home, you find another synagogue or another community to be a part of. Among Jewish groups people come and go all the time. People change groups, and sometimes even leave Orthodox Judaism entirely, unfortunately. We exercise no mind control over anyone, and we cannot prevent anyone from doing what they want. Of course, if we know someone is slipping in their observance, we will often try to befriend them and try to help them deal with their difficulties.
Cults often employ violence against dropouts.
Most of the time when someone leaves a Jewish group no one even realizes it for a while. Maybe he just went away for a while. It's really not an issue. Because of dropout control, many cults refuse to let their members live at home. Most people joining Orthodox Judaism continue to live at home, though they often travel to Israel or elsewhere to study for some time in a proper yeshivah.