While Demo is correct (as always), there is another solution if you prefer:
Since your phone number is associated with a non-Apple device, it makes no sense to use it as a potential iMessage recipient address.
You could go to Settings > Messages > Send & Receive and delete that telephone number from the candidate addresses you may have there. To delete, you may have to click the little white arrow in the blue circle on the right.
This way, you could keep iMessage on for other purposes, if you wish.