I know the feeling. Before I had locks, I showered once a week at most. I didn't smell, and I didn't feel grimy, but it doesn't mean your clean. Same with hair. You're lucky it didn't itch. But just because it feels ok, doesn't make it clean
Congrats. But why did you wait so long to wash? You should be washing every 2-3 days. Just because your hair didn't itch or smell doesn't mean that it is still clean. And locks need a healthy scalp to grow healthily.
You could substitute ACV for white vinegar if you have to. Just use a little less. But get some ACV asap for your next wash.
Again, congrats. Doesn't it feel so good to wash?