I definitely agree with what you’re saying about not knowing when you’re talking too much or not enough. I have definitely been in situations where I thought I had something to say and when I finally opened my mouth it was that “I understand everything’s that’s going on” rather than the “What if we tried this?” although I am not on the creative side and on account management here at my internship I have been to many meetings where my input is asked. It is easy to understand now that if they did not care what I had to say then I would not be invited to the meetings in the first place. I am there to listen and give input when appropriate. You definitely don’t want to be the one always talking and drawing attention to yourself because then it is seen as unprofessional and obnoxious but in the right time and place agree that you should definitely not be afraid to let your voice be heard. An intern is there to give fresh insight into a new situation.