i need to buy 300$ in bitcoin can pay via paypal, let me know who can help me out.
It's far too risky to accept PayPal from a new account, you'll have to find another way to pay that's less prone to charge-backs if you want to deal with honest sellers.
I would not have bothered but looking at your profile, I had to as you are a newbie here. Since you have been given a link here already I commend that but I will advise you to always use an escrow when dealing so as to avoid being scammed as there are scammers everywhere looking for who will fall prey to their activities. Carefully use a reputable high-rank member here as an escrow.
Lastly, I would want to know why you never bothered wanting to use the cex for fast, secured, easy and safe transaction. Atleast there are lots of cex here and an example of the is Binance .
First, it's the OP who is in a position to scam since he's paying with a reversible payment method. Second, No escrow will deal with PayPal. To make the transaction completely safe for the seller the escrow agent would have to hold the BTC for 6 months, until PayPal's window for disputes closes. If he doesn't, the seller has no protection. And I doubt the OP wants his BTC tied up in escrow for 6 months.