Karen, You should be very excited about your 5K!! You are going to have so much fun! Just remember...it is the first of many and this one should be used for learning purposes. Regardless of your time, you need to finish proud of yourself! It takes courage and guts to get out there. One of the things you will quickly learn at these races is the incredible amount of mutual respect the runners have for each other. The elite respect and admire the last runner in...just as much as that last runner in respects and admires the elite...because it take courage and guts!
Time doesn't matter. We all have time goals but that never dictates whether or not we call the run a success or a failure. If you do your absolute best AND HAVE FUN, then it is a huge success whether your time is 23:00, 32:00, 45:00 or 55:00. You could run the fastest, best race of your life but if you were miserable the whole time...what was the point? The cash prizes for 1st place suck! Not worth the effort!
As for making your loved ones proud...they already are!