You are most definitely able to eat tuna raw and out of the can but first you might want to drain and mash it so you can have sandwiches. There are many different things that you can do with canned tuna, including using it in dishes with rice and, salmon, and noodle salads. Although fresh tuna is much healthier and nutritious, canned tuna can still taste great and offer some nutritional benefits as well.
It will also be a good idea to make sure that you buy the kind of canned tuna with water instead of oil because it is much healthier in general. There are all kinds of recipes that you can look up online so you can see what exactly your culinary options are when it comes to canned tuna.