Learning Japanese is hard

Like shit will probably make sense the more I learn, but god it's so confusing. Like Konnichiwa is the simplest Japanese word people think of but even that is a bit confusing. It's こにちは, but that last hirigana isn't "wa," it's "ha." Why? NO FUCKING IDEA! Why is one in japanese いち, but the first day of the month is ついたち???? NO IDEA! Don't even get me STARTED on は and が