Hey man! First of all thank you for your donation, it's much appreciated! Secondly, if you want to pay a lesser fee, add 20€ to your PayPal Balance, then do the payment. They will only use your credit card to pay for the fee, not the initial transfer, and the fees will be smaller.
One more thing. Since you live in Italy, you use euro there, and Linux uses the serbian dinar, so there's also a conversion fee. To pay even less, let your credit card issuer do the conversion instead of PayPal, you will always pay less if you choose that method.
You can see what I'm talking about here https://i.imgur.com/249PjGk.png and here https://i.imgur.com/0H697YJ.png . It goes without saying that you should send the payment as to a friend, and not as a business transaction.