I feared being hated if people found out. (Para.7)
Meaning: I feared I would be hated by people if they found that I was sexually involved with men.
find out: learn or discover a fact that is hidden
Did you ever find out why he left his job? 你知道他为什么放弃自己的工作吗？
We must find out the truth of the accident. 我们必须查明这起事故的真相。