If your first road race is hilly, you’ll always get a bit of a kicking. The hills sort out the riders so fast you’ve no chance of staying there unless you are a very accomplished rider already. It’s also pretty well into the season, so half the field will have raced a lot already this year, and playing catch up is never fun.
Best advice is to enter as many flatter races as you can to develop your skills, and use what you learn to guide your training this winter…
…and the way to move up categories is to learn to sprint, because just about every race you enter will end that way.