You're probably plugging into the inside of your ISP's CPE (Customer Premise Equipment) Modem/Firewall/Router combo. If you log into THAT device and put it into "Bridge Mode" you should get a public IP.
But basically, you're double NAT'ed otherwise. Only difference between this and CGNAT is that the IP your ISP gave your modem isn't shared by dozens of other people.
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You're probably plugging into the inside of your ISP's CPE (Customer Premise Equipment) Modem/Firewall/Router combo. If you log into THAT device and put it into "Bridge Mode" you should get a public IP. But basically, you're double NAT'ed otherwise. Only difference between this and CGNAT is that the IP your ISP gave your modem isn't shared by dozens of other people.