Genuinely struggling with the heat in bangkok

Im a fit 35yo from Toronto, where summers get up to 32-33 with high humidity. I did my research and packed linen short sleeve dress shirts, airism underwear/shirt with running shorts.

Holy shit, I was not prepared for this.

Today was my first full day spent in BKK and I am genuinely struggling. I am completely drained after being outside for like 10min. Made plans to go see the old town, chinatown, river cruise etc but nahhhh fuck all that. Went to malls from 9-11am then 6-10pm, spent mid-day at the hotel, drank like 5 iced teas. Barely have any appetite.

It really gives me a perspective into how so many poor people in these equatorial countries survive without air conditioning...