True, of course. But you'll remember that early Christians met in the catacombs and used a fish symbol as a code because of the physical danger involved in being a Christian in early Rome. Once discovered they were quite valiant in facing torture and death, they did evangelize, but they did also try to avoid discovery by the people who would kill them.
Meeting is secret is not hiding your conversion. The early church is full of martyrs (and the apostles especially) - not those who run and hide.
If you feel you have to hide your conversion then, rightly so, many believers should question your conversion.
I am a cult deprogrammer and have a transition ministry. I deal with helping people transition out of cults and into Christianity (Mormonism, SDA, JW, Islam, atheism, Scientology, etc) and in all of the cases there is a fear of reprisal - either from the group or its members. Loss of job, loss of friends, loss of family, loss of marriage, loss of life, so this is a topic I deal with on an almost daily basis. And one of the things I help them work though is counting the cost - and following through that what we gain in Christ is more important than what we will lose by publicly confessing him. Another area is teaching them how to witness to their loved ones still in the cult.