Birthdays can be quite emotional.
I think everyone has at least one traumatic party memory - often involving people not turning up, you aren’t alone there.
I also think you pretty much have to organise your own birthday celebrations, I know I do.
80 people is really massive, unless you regularly have huge events, so next time just stick to a couple of close friends or a small party.
So basically - don’t give yourself a hard time.
However - you also need to knock off feeling so sorry for yourself, because the only person you are hurting is you. Who is the small act of rebellion of chucking away cards and presents your friends have bought you going to hurt except for you?
Do what you can to enjoy the rest of the day and plan a small celebration in 3 months time - your milestone and a quarter.
You just haven’t learned how to plan a decent birthday, there are plenty of threads on here, just look them up.
If you are generally inclined to get yourself into this state then think about seeing a counsellor. Or if it’s birthday specific it should be easy enough to solve.