Try creating or finding your own opinion. By creating, I mean trying to reach a conclusion about something you're thinking about. You can do that by asking yourself every question you can think of. What's my favorite color? What kind of music I enjoy more, and why? Why are some people evil? How can someone feel sad after watching an awesome movie? What makes a movie awesome? What is right and what is wrong? You can ask superficial or deep questions, and just by trying to answer them you manage to get a lot of information about a lot of things. By finding, I mean researching something, usually to get more information to reach a conclusion, or to see someone else's viewpoint. This can be done by reading, listening, touching, talking, basically anything that you makes you absorb information.You can read an article about health and say "Hm, I agree with that", and that's you just getting yourself a new, fresh opinion, based on someone else's. It's not as easy as it seems, it takes work. But it is rewarding. By the end of each questioning, you build a bit of your own identity. PS.: I'm not really sure this is your main issue, so forgive me if I said something unrelated to your issue.
