Czesc, you've forced me to come out of the shadows and provide you with a few points to consider:
1. You were waitlisted at Princeton. The last time I checked it was still an Ivy League institution and considered one of the best universities of higher education in the world. The fact that you were waitlisted, and not flat out denied, means you possess the qualities necessary to be successful in the program. You should be proud of that.
2. Someone (I’m thinking at least 3 someones), other than your mother, believed in your abilities as a historian and decided to stand behind you by providing a letter of recommendation. This, too, is a sign you're on the right path. I've known professors to refuse to write recommendation letters, if they thought an applicant couldn't handle the rigor of the program. Your recommenders felt you had a shot, otherwise they probably wouldn't have written on your behalf.
3. If you were talented enough to be waitlisted at Princeton, I'm sure one of the 10 schools will have a spot for you.
REMEMBER, ALL YOU NEED IS ONE.