How would you handle this?Sad day on the school bus?

Today's the first day of school and i drive a 9th and 10th grade school These students are my only route, and after I drop them I take a shuttle to the career campus.

I always pick up every piece of paper on my floor after route. I don't care about homework or other stuff. But I found a folded up post it note with this written on it:

Useless (written 6 times across the paper)

diediedie (written over 13 times across and under "useless)

good for nothing NOTHING

fatfatfat (15 times or so)

and in bug letters under these words:

UGLY SH!T

I want to die

Holy cow I do this, not because i can't do anything else, but because I was also neglected when I was a young girl and i think I can help these young people. I ususally enjoy this job and the young people so much. There is not one fat ugly useless person on any of my buses.

I alwasy every year get up and tell the teens that if they need help to write it on a piece of paper, fold it and drop it on the floor and I WILL see that they get help without anyone else knowing it and their privacy will be respected to the full extent. I've never had THIS happen and since today was the first day, and i didn't tell them, this was unique. This is killing me. Should I give my talk and act like i never found this? I feel horrible but to report it would not be of help since there were so many other students who got on the wrong bus or whatever due to the confusion of the first day. I so much want to help these troubled students.I'm heartbroken