I found out some weird stuff and I haven't told my best friend yet.
How did you find out about this stuff?
I did my own research on the Internet
It's understandable there is some information you would rather not share. You don't need the share everything with everyone, withholding information from certain individuals could be the best thing to do. If you tell everyone everything you could potentially reveal information that could harm them.
Yeah I'm kinda rambling here, I'll shut up now.
OK, take some time to reflect on how much you want to divulge to your friend. Good luck.