Should I Forgive Myself For Accidentally Writing A Really Bad Script? (Common Experience?)

So I turned in a script in my Screenwriting Class and when it was time to critique everybody's script, mine got ABSOLUTELY MURDERED, so to speak. It's been a while since I've been that disappointed in myself and not a single person said anything good about mine, yet everyone else's had mostly positive reviews. Should I forgive myself? I'm only a university student and a Screenwriting newbie, but so is everyone else in the class so it seems to make no difference.

It kind of sucks to learn you suck at what you want to do as a career, especially when everyone else in the class is kind of good. Is this a common experience for someone around my age? Anyone in this sub eventually have success after an embarrassing public failure?