My bumps are huge at the back of my tounge
And I'm so scared?
Any experienced physician has had numerous patients worried that the taste buds in the back seem too large, but then they look normal to the doctor! It seems that for some reason we can get pretty far along in life before we see them for the first time.
Of course, since I'm not actually looking at your tongue, I have to recommend that you be examined by a doctor, to be sure.