Why do I have crater like holes in my inner and outer labia lips?

You're going to have to go to the doctor, unfortunately. If you don't want your parents to find out just tell them you're sore and don't know why so you need to see someone. They cannot tell your parents what's going on. You might have herpes or HPV or something. This is an STD or STI. It's not normal to have symptoms like this so you need to get checked. Herpes can present like this. It might get worse and you might keep trading it back and forth. It doesn't matter if you've only been with one person. You can absolutely get infected. That's how it works. I don't want to freak you out too much but this is a situation where you must get checked and you need to get some kind of medicine for it. I know it's embarrassing but you're going to have to suck it up and do it. That's one of the things you have to deal with when you're sexually active.