If you want the best feedback go to your health professions office and have them edit it. There are many good people on here but you don't want to trust your personal statement with an anonymous person.
Do you know of one of those specific forums? I found an "Official PS review" thread on SDN pre-med and sent my PS to some of the listed readers but none of them replied. I wasn't able find a similar 2012 group on pre-dent