There is no safe way to do that, and as others have tried to explain to you, it would leave an unsafe result. Worse, your sense of smell and retrolfaction are far more critical in the perception of complex flavors than your tongue, which really does only the basics. Your tongue is far more about telling you quickly if you're eating poison than enjoy much. If you've ever had a bad cold, or allergies, you know this all too well. Worse, you may have found, not an inability to taste, but an altered taste that made things disgusting.
This would be an insane thing to do, a very permanent and dangerous kind of desperate self-harm that I would compare to someone in pain asking how to sever their ability to sense discomfort. It's a reason for you to see someone to help you achieve your goals without harming yourself, and if need be, to address this desire to harm yourself at its root.
All of that being said, since I don't believe in mothering people, the ways that people lose sensitivity to tastes in the normal course of life are:
Excessive smoking and alcohol consumption, lots of excessively spicy foods, and after a couple of decades you'll have a leather tongue. And your liver and lungs will be screwed, so you won't have to worry about your eating anymore; a bit like curing depression with a shotgun to the head.
Scarim Coral said:
You are aware that if you lose your taste bud, you would loose the ability to taste bad food right?
Sure they could be an upside like tasting a person burned cooked meal but let's be realistic. A food taste bad is a warming send to your brain that you may or may not want to eat it. Imagine if you ingest an out of date food despite it look ok at apperance. Sure you will say you just keep a look out on the food dates and apperance but doesn't means appealing food will taste appealing and even then, if you fine eating bad food doesn't mean your stomach will want to keep it in and out the natural way.
Even then I can't remember the exact science and biology but since taste is linked to smell, would you also destroy your sense of smell aswell?
Yes, and the part of your body responsible is actually part of your brain that exits in little tendrils through the cribiform place in your skull. Needless to say, you don't want to go attacking this willy nilly.