Of course you own Bitcoin Cash equivalent to the amount of Bitcoin that you hold before the Bitcoin Cash hard fork was happened months ago and you can still claim it anytime you want (same as other fork coins). But you can only access or claim it if you stored your Bitcoins in a wallet that you hold the private key. What you will need to do is create a new wallet and transfer all of your Bitcoins to that wallet/address and you can now import your private key to a Bitcoin Cash wallet that allows you to do it, you can try using electron cash or coinomi wallet app.