A good participator in a seminar will always invite other people to comment. To start with, you can make supportive noises or say things like 'yes, I think so too', when you agree. You can work with other members of the group - not just when you are presenting but when you need to respond. You can invite each other to comment. Love yourself a little.
Education here means more than just having information.
It means knowing what to do with it so that you can use it to create new ideas and forms. It involves analysing it for yourself to try to understand why something happened, not just what happened. It means developing new strategies to understand not just your own thinking but other people's way of thinking and acting. In essays or examinations, you are never asked just to repeat information 'parrot-fashion', but to use your knowledge to answer a question. This means working out what the question means and what it relates to, so you need more than just a good memory for information.