Eventually the instructor couldn't bear to see me in action anymore, and he promptly asked me to "take a rest" at the side while the others kept training. Of course that was codeword for "Stop embarrassing yourself and me, I will not have you insult my dojo". So I stood at the side as the rest continued their drills, slowing waiting for my arms to regain some feeling.
Finally after what seemed like an eternity he let me into the sacred circle again. This time I was resigned to the fact that I had no dignity left. I will probably be, from now on, known as the Indian guy with the flailing girl arms. So I took my time with my punches and kicks. It was still really tough, but at least I reduced the amount of senseless flailing that I had resorted to earlier and did regain some measure of dignity.
Finally (and thankfully) it ended. My arms hanged uselessly by my side as I thanked the instructor, I had no more strength to even lift them. I took a quick shower and headed back to the train station. And I realized I couldn't climb the stairs to the station, my legs and hands just wouldn't obey my order for them to go against gravity. I had to practically haul myself up by pulling myself up using the metal railing at the side of the stairs. A man who was going down the stairs looked at me as I struggled up, and then he fished out his wallet and offered me ten dollars. Yes, he thought I was some sort of poor invalid and he was probably impressed that I could actually climb the stairs or something. I politely declined by grunting (I was too tired to talk) and he apologized and hurried away.
So that was my first taste of muay thai, AKA bloody torture. And I am going to do it next Monday as well. Yes despite all that pain, it was actually very cathartic to punch and kick the damn bag, I was imagining someone I really hated while I was doing it, and for that brief 5 minutes it felt good. And also it was an amazing workout, my hands haven't felt this exhausted since that 6 hour porn marathon I went through when I was a teen. Let's wait and see how my 2nd lesson goes.