Unfortunately it’s not just a few bad apples, the guilt-laden, restrictive environment @User63847484848 describes is a common experience for many, many young people growing up in these churches.
Why on earth is sex before marriage bad - now, in the 21st century? Or in the late 20th century? I can see that in the subsistence-agrarian society of biblical times sex outside marriage would have been socially disastrous, but now? Really?
The social necessity for strict religious control (not that it was ever that successful over the last 2100 years) has been replaced by the rule of law, secular morality and the structures of civil society.
I have said it before but I don’t think any religious group should be allowed to evangelise to or accept donations from young people under the age of twenty-one.