Like everyone else has said - well done mate.
I think that we all naturally get a bit figure-focussed but as everyone else has already said - consider what you did achieve.
Go tell a non-cyclist that you cycled 42 miles and they'll find it hard to believe - it really is a blooming long way.
And, you've had a great training ride for your forthcoming 50.
I do know how you feel though (and, I'm really not making this up). A month or so ago, I set out to do a 50 and, on that occasion, guess how far I got? Yep......42 miles.......that's uncanny (especially as 42 is the answer to life, the universe and everything). The very next week, I added 10 to that for a good half century.
You'll get it next week, or the week after - but who really cares as long as you're have a good time and enjoying your cycling.
Keep it up mate.