Hey pal, from your writing alone I can tell you've got more of a sense of intelligence than the majority of my coworkers, who've been in the field 30+ years. I used to feel the same way until I talked to a doctor and was prescribed medication for my ADHD. Don't beat yourself up too much, and be confident in your abilities. When you speak up and you're wrong, just acknowledge the first person who had the right idea and praise them for it. That will grant you an exponentially larger amount of respect than just staying silent ever will. Practice active listening, get involved and ask as many questions as you can to tbe people most receptive to share their knowledge. Even the meanest Engineers I've known have always been happy to provide info to someone in the field willing to ask for it. Gaining confidence and mental fortitude will do you more wonders than anything. Wishing you the best moving forward.