Can someone explain Mahjong rules and scoring to a confused beginner?

Im trying to learn how to play Mahjong i wanted to get a board but after seeing the price I decided to download an app version first and see if I like it and if im any decent and now my head hurts.

I thought the goal was to get as many 3 pairs as possible but then someone with less pairs is winning im so confused and it makes no sense it seems like there's 95 different ways to play it. I thought od be good as im usually really good at these sort of games especially Rummikub.

There is a club in my local town that meet up once a month but it won't be for beginners and ill probably be laughed at
Can someone explain Mahjong rules and scoring to a confused beginner?
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