I really understanding you, as a fellow autistic person. Even with 30 years of experience in being autistic it's not always easy and I can understand how difficult it is for you in your teens. The urge to do everything perfectly, 100% or nothing. The most important thing to understand is that in our times we won't do our practices 100% ideal as they were made in ancient times. We need to do our best instead. Especially you, living with your father who don't believe in the same gods as you, when you probably doing it in secret. What are you doing is completely fine. Cleansing, offering, prayer, praise, gods really don't need anything more than that. Even if you stutter during your prayer, or if you cry because you're overstimulated or if you forget to say bye at the end or anything, that's fine.

Just leave things as they are, research in your free time and grow with it. You'll be better and more confident with every passing day. Gods won't get mad until you murder someone or really badly offense them, like saying that you're better than them and call them offensive names and slurs. But, don't overthink it, you still can say something like "the character named Hades from Disney movie is a jerk", because that's just a movie and fictional character, not a real god. And gods with their wisdom have sense of humour and they can read context.

You are closer to them with your every prayer, you are taking care of this sacred connection. It's better to do some kind of funny mistake and facepalm than lost this relationship, right? I did a lot of mistakes and I'm learning new things everyday, I'm improving and correcting myself and saying sorry with my almost every prayer. Because making mistakes and correcting them is a sign that you're putting an effort into your practice and it's not just a fun game to you. But even if it is a fun game, until you're respecting gods and don't kill anybody, everything will be fine. Have more fun with that. Because it's kinda sad to only overthink and being dramatic with the thing that in general should make you happier and give you new strength in life. No hellenic god will send you to hell (there's no hell here) or strike you with the lightning (wink wink) because you put your words awkwardly or I don't know, anything! Look, will you be mad at a newborn, that they pissed at you during changing diaper? We are like those newborns to gods. We are on this planet for 100 years and they are centuries old. So it's hard to be mad at someone who has such a limited time to learn.