wireguard vpn cant acces to the internet

I’m looking for a way to connect my wireguard VPN to internet with my other interface eth0 and give it to other peers. When I do:

ping -I wg0 google.com

I get no answer even though the DNS resolution works. Here is my wireguard configuration :

[Interface]
PrivateKey = <private-key>
Address = 10.66.66.1/24
ListenPort = 51820

I have seen some people use iptables to do so but it did not work with me.