message sent dont forget paypal is reversible.
So even they do receive btc they can easily get the btc and charge back paypal.
OP is buying bitcoins in exchange for his paypal funds, quote opposite of what you're thinking.
@OP go for virwox or withdraw it to your bank and then make a trade, no one is dealing with a newbie who is buying btc with a highly reversible payment method.
Who is the escrow? You will need this because without it a seller has absolutely zero protection.
Quite sure, even with escrow seller(of btc) has zero protection