strings tend to dull out over time, I usually change mine at least once a month, even if they havent broken. I would say its a good habit to get into changing all your strings at once, unless you cant afford strings all the time. Keeping your strings sounding bright is a part of the maintenance, so I would say go ahead and get used to it now. Changing strings isnt that bad if you turn it into a form of relaxation, put on some music and get some tea or coffee or something. Its also a good idea to clean your fretboard while your strings are already off, before you put the new ones on.