Question

There’s something that really bothers and frustrates me. I’ve been learning for several years already, and I try to think and delve deeply and form an opinion, and not only in learning.
Then I speak with people who are more talented than I am (or write a question on the site), and I discover that my thinking was nowhere near the beginning and that I was simply mistaken and drew serious logical errors. And that’s when I’m being honest with myself and striving for the truth.
And even when my opinion isn’t wrong, there are still so many possibilities and assumptions that aren’t necessary, and one could assume differently and reach a different conclusion. So what does truth even mean in relation to that?
And I wonder why I should trust myself—what place does that have, when I’m striving for truth no more than someone else’s opinion, since I’m no less prone to error than anyone else?
And why should I determine things for myself more than someone else should determine them for me (with respect to truth)? And what place should be given to my own understanding?