I'm very obsese - BMU 51. I too feel very embarrassed and ashamed. I have started eating keto and am about to start week 7 of couch to 5k thus week.
I also have asthma and kidney disease.
I realise it's all too little too late to lose such a significant amount of weight before things go back to normal, but I have seen some positive health improvements that I hope would improve my chances if I were to catch corona:
I have lost 8kg so far
I am now not sedentary but running 3 times per week
My blood pressure has dropped from average of 140/90 to 105/60
I am hardly using my reliever inhaler.