For starter let me say, it is not what you write but how you write is what we graphologists look at. i.e. stress on the 3 different zones, the over all speed, structure, rythm, flow, individual word and letter formations etc is what really matter."but only i can read my on handwriting..."
"but my handwriting is very dirty..."
"but my handwrting is not good and illegible..."
Let take for example i may say "I am happy" but my action, tone of voice etc. may be saying something to the contrary. Would you be likely to believe a person if he/she says "I am happy" with heads down, hands on the forehead, a frown on the face, and in a low / depressing sounding tone.
There you have the answer. I would not even for a second believe that person and i think you would not too.
It is not what you write but how you write it that matters when analyzing handwriting.
till next time
Abhishek