There are four switchable game difficulties in the options – easy, normal, hard and peaceful. If you are leery about facing monsters just yet, turning on peaceful mode (or simply starting off in it) would prevent them from appearing. The other modes are self-explanatory, but are outlined in detail at Minecraft Wiki. If you aren't interested in killing zombies and skeletons at all, you never have to leave peaceful mode; if you want more of a challenge, however, easy, normal or hard difficulty could keep the game exciting. Protecting your village from a mob of monsters at night can be quite the task, if you are up to it.

So show your significant other your shiny Minecraft game, and don’t lose heart if they don’t seem interested at first. As long as you know what games they prefer, chances are you can find something for them to enjoy, be it conquering monsters, growing crops, raising animals or fortifying villages. Show them some videos or some scenarios in your own world that might appeal to them, or some mods and texture packs. The sooner you can make a Minecraft fan out of them, the sooner you can share your new hobby.