Feeling like I can’t trust anyone!

I’m in a few spots where I need other people’s advice and guidance on things, from lack of my experience, but I feel like everyone is trying to persuade me and get me to do what they want only for their benefit! Like they’d get something out of it if I did this or that. In any of my relationships, I feel used. I feel taken advantage of. But maybe MAYBE these people actually care about me and it’s not all about them? How can you know the difference???