Originally posted by Elizabeth Maybe "dekinai da yo" is a better change if you want to make it more emphatic. "Amari (yoku) dekimasen" seems to be more or less a set expression you don't often see other modifiers added to. I don't know exactly how "jitsu ni" sounds in Japanese but the English translation as "indeed" or "really" creates a sort of distant or more formal effect. Of course it'll be simply "kanji ga amari yomenai da yo!" once you learn the potential form...
Although "本当に" works fine, MtoM, if you really are under the impression that kanji is just about impossible. In that case :
"私には漢字を読むのが本当に難しすぎ(ます)....Kanji really is too difficult for meという風にですね。