Yes you can create you own altcoin in easy ways. If you are familiar with creating a erc token you can just go with ethereum platform. But you need to have some eth in your wallet for creating a token. If you are good at programming your own altcoin with C platform then you can go with linux or windows for creating.
For creating a token, go to your official ethereum wallet and click on contracts. Once you have done them visit this
link and create your own altcoin.
If you are sure to create the coin with C program then check this
thread on bitcointalk on how to create your own coin.
If you can't follow the instructions above check this
thread which gives a clear insight on how to create them with windows.