Congrats on surviving your first race! Now, one of two things will happen. Either you'll check the accomplishment off your bucket list and say "thank goodness I never have to do that again", or, like the rest of us crazies, as soon as your legs and lungs recover, you'll be itching to try it again
Note that in most regions, CX races don't DNF riders for going a lap down. If they did, all you'd need is one sandbagger in the cat4/5 race and 75% of the field would DNF. Instead, you finish whatever lap you're on when the leader finishes and the results just list your time for the laps you completed with a "+1 lap" or similar notation. My region will let folks finish 2 or even 3 laps down as long as they aren't too much of a hazard to other racers.