Firstly, if it's any consolation at all, pretty much everyone I know has felt the same way as you are now. You are not alone in this and thank you for having the courage to reach out!
As
@SportsThoughts so eloquently said, the time is only lost if you do not use it. My target right now is to try and learn at least one new thing every day that can help my commercial awareness. As such I'd really recommend looking into some of the courses I recommended in the 'Vacation Scheme Preparation' thread as they're helping me pass the time at the moment.
There are still TC applications available (most close end of July I believe) so I'd recommend checking some of those out if there are any firms of interest there.
Hope this helps but please feel free to discuss further - I know a lot of will people appreciate your candour