Hold on mate, aren't you quite an experienced racer? I seem to recall a lot of good advice from you in the past.
So first of all, I'd look at some of your own great advice
Secondly, I'm the same. But I take stock, really focus at what went right and only then look at what can be improved
. It's hard to not see it as a disappointment (or in my case a failure), but if I can get a ride in later in the day (when it's a TT or a mental early road race start) or the next day it's perfect for reflection.\
That 'disappointment' then becomes fantastic fuel for training.
You're only as good as your last race, sure. Cycling is a tough mistress, she takes no prisoners. However there is always an opportunity to redeem yourself.
Also keep in mind, unless you're being paid to do it, who and what you are are not defined by your last race result. That's losing or winning.
Now I just need to try and remember all this myself
when it means so much it can get hard.
And I should add none of this, for me, would be possible without my outstanding coach! He is a legend