different

we are all different people on the outside than on the inside. when i look in the mirror i dont see myself i see a different girl not the girl i used to be i have short wavy brown hair and brown eyes,i used to have long straight  dark brown hair and grey eyes, i see a mad look on my face every morning i used to keep a smile on my face everyday even when i was sad. i act different,look different and think different am i still the same person? how am i so different????