Kratom question- is this a good starting dosage?

is this a good dosage? I don’t have an opiate tolerance

I’m 220 lbs and 5’11. I took an entire packet of this powder stuff that you mix into water, which would be 100mg of mytragynine. Is this an ok dose? Pls tell me I’m not cooked. I took it like 15 mins ago and I feel slightly warm and relaxed but that’s about it. Anyone have any experience with it?