Good for you! I would have left, too. Just take a deep breath and settle down a bit. If you're super excited when you approach the pigs, you'll scare them. It's hard, but try to be calm when you approach them, and speak softly.
You might want your Mom to order this for you while you wait:
https://www.guinealynx.info/record_book.html
You can keep track of your pets health and weights in there, and take it to the vet with you if the pigs get sick-it has the best medicines to use and the ones to avoid listed in there.
Your Mom and/or Dad should educate themselves, too, since they'll be paying fo the vet bills. Have them read these following links with you. You don't need to make decisions by yourself.
Check out this link:
https://www.guinealynx.info/health.html It tells you what the signs of illness are so when you go to look at the pigs, you can check them out to make sure they are healthy. I know they hide it when they are sick, but just do the best you can, and ask questions.
MAKE SURE YOU SEX THEM YOURSELF BEFORE YOU ADOPT!!!!
See here:
https://www.guinealynx.info/sexing.html You do NOT want a pregnant piggie. It's dangerous, and then you have to find homes for the babies.
Good luck, and take your time choosing a pig. They will be with you for a long time.