Hey now, don't get yourself down like that! I think the fact we're waitlisted and not straight rejected means our profiles are competitive! This pandemic has really made this grad school application cycle rough for even the smartest people I know. And getting into UPenn is not easy, they wouldn't accept you if they weren't impressed with you! People get accepted and rejected all over the place that they don't expect because there's a lot of people applying and a lot of the time it really goes down to luck and having the right person reviewing your application. Although you get a rejection with the school name attached, it really is just a handful of people who look at your application and they definitely don't define what your self-worth is. You're a strong candidate, be proud of that and try not to let the rejections get you down! (Easier said than done that's for sure though)