Solfege Makes Me Feel Stupid

Do re mi fa so la ti - that shouldn't be so hard, right? If those kids in The Sound of Music could jump on board in the course of one montage I should be able to, right? I know I did it in high school. Do di re ri mi fa fi so si la li ti do - do ti te la le so se fa mi me re ra do - see? I remember. Man, high school was a long time ago. But can I attach them to notes? Apparently not. I hate this whole "practice" thing. Boo.