I eat 2 lbs of tuna a day and have done this for 2 years. When I told a friend this he asked how I wasn't suffering from mercury poisoning. Should I be worried?

So the title pretty much sums it up. I've eaten 2 lbs of tuna, 2 bagels, and a bowl of mixed vegetables as my one meal of the day every day for the past two years.

A friend saw me eating today and asked how much tuna I eat and I told him. Afterwards he told me about mercury in fish and said that it's not good for me.

Should I be worried?

If it matters I'm 6'4" 220 lbs 22 years old.