Episode 37
If after that episode you don't feel it, One Piece is not for you.
But know that if you get hooked
(which is the case for most people)... you will later rewatch what you forced yourself to watch with a new fun mindset and you will enjoy it much more !
Three advices tho :
1. Stay away from this forum until you finish the anime and the current manga. Do the journey on your own and watch reactions along the way, but don't stay here. People here tend to be very bitter about the story for very bad reasons, most people lost the flame and do not enjoy reading anymoren the story is not responsible, the toxicity relative to any fandom is. So if you stay, you risk indeering your own enjoyement along the way. Try to find people who still enjoy it !
2. The story is much deeper than what it appears as first and the author will not take your hand to understand everything. A great deal of empathy and questionning is needed to have the full experience ! Keep that in mind.
3. Keep a notebook just in case beside you to note everything you think is important, you'll thanks me later.
Have fun !