I have $100 paypal balance want to buy BTC,i know i am new here,i will go first to trusted member or use escrow
Even if you go first, it is not risky for you but the person accepting it, since Bitcoins are irreversible but Paypal isn't. Try https://www.coinimal.com/ I haven't used them personally but they do offer buying bitcoins with Paypal.
From their front page:
