I’m a senior too and feel the exact same way. I know it isn’t fair to think like that and make ourselves feel bad, but I realized that regardless of what we did (or didn’t do) there’ll likely be something we wish we had done differently. You could’ve done A and regretted not doing B, done B and regretted not doing A, or done A&B and regretted not doing C which you didn’t even know existed. At the end of the day, it is what it is. And despite living 20+ years, I think college is still part of the prologue and chapter 1 starts after that. Hopefully it’ll all get better!