Yes, someone can launch a DDoS attack against your public IP address. Suppose your system has security vulnerabilities or unprotected ports. In that case, attackers can send large amounts of traffic to your public IP address to overwhelm your network and disrupt its services. To protect yourself from such an attack, secure your system with strong passwords and up-to-date antivirus software. Additionally, it is important to hide your public IP address so that potential attackers cannot target you.