I had a very similar time when doing work experience. What helped me is to remember you are experiencing one specific work environment, culture, set of people. Part of work experience is to start figuring out the type of role and company you would want to work in. In honesty, it will probably take several years of entering the work force full-time to really figure this out, but the bad experiences are as helpful as the good ones. Now you know that wherever you're working right now, probably isn't the right place for you.