Im in the same boat my friend. No one I know gets as high as I do after smoking one and this includes people that smoke significantly less frequently than I do. Even as a multiple-times-a-day smoker I dont find myself building a tolerance from day to day. Ill take a few hits off a joint and it will be instantly noticeable to others that I am high, especially because of my eyes which have been described as "red as the devils cock" haha.
The solution would be to find the type of high you most prefer and learn what works to acheive that. I find that smoking exactly the same herb with different roa's (joint, pipe, bong, vape, edibles, etc) can set a different tone for your stone based on the amount you ingest and how quickly you are able to get that into your body (ei. a bong has a much higher payload and much lower administration time than say a joint). Its all about finding what works for you. Personally, I find a hit or two off a one hitter to be the perfect amount for me because it allows me greater control over the amount I smoke.
Consider your sensitivity a blessing. You can save alot of money by using only the amount that you NEED. Smoking isnt a competition. We're doing this to have a good time, so there is absolutely no need to smoke bowl after bowl just because the people around you are. Find what method/ amount/ strain works best for you and you'll be alot happier with your highs.