It’s just a test. Don’t let a number define you.
Also - this is the beauty of the ramp test. Don’t worry about time, don’t worry about past performances, don’t even bother to compare PRs - just go until you can’t go anymore. You’re in your head too much. 
I know you’re disappointed, but take that motivation into nailing your next block of workouts instead of trying to dissect how to take a ramp test better. I mean - the point is to become a faster cyclist, not be a better ramp test taker right? ← this is said with a slight laugh and a joking tone. lol.