Your curiosity is admirable. Please keep it. I wish more people would openly question things in this manner.

To answer your questions: No, you should not believe everything you are told. You should look at how credible sources are. I err with science, and for me, religion that discredits science doesn't work. I do watch a lot of conspiracy theory things... so many sources are full of absolute crap, but it is fun and I find strings or theories, but little proof or truth. I'm afraid that if I didn't use my brain, I'd wind up believing all sorts of things. Things I know are untrue. Keep your eyes open, keep the healthy questioning and skeptisicm.

My other advice is to remember that the truth can change. Science disproves itself as we discover new things. And this is fine and expected - as long as your views change with new facts, you'll be fine. My big example is always religion - If any god or gods give me unrefutable truth that they exist, I'll believe in whichever god or gods gave me proof. Otherwise, I'll trust in science, keep some distrust for the sensational small-study 'breakthroughs' and keep on my own path.