I don't think it is that unusual for people in their twenties to get bored. You spend your time at school/college/uni working hard, aiming high and then you get what you think was your ideal job and if you are not careful then you think "is this it? is this what I was striving for?" closely followed by "been there, done that, now what?". Many of my friends had this at varying times in their twenties. On a positive note, most of us in our thirties have either sorted it out or are in the process of doing so. I know you said you were not looking for a psychological consultation but if you are open to advice then read on.
My suggestions would be think about what bores you - the people? the type of work? and then think about what you enjoy and leaves you challenged/exhilarated/motivated. Try and work out how you can do more of the good stuff - it might mean a sideways move. Is your work too easy? Stretch yourself either at work or outside. My opinion is that it is unrealistic to expect to get all your life's fulfilment from your job. There's no reason to settle for a miserable McJob if you don't want to but if the job is essentially good, consider filling gaps with things outside work. E.g. learning a new skill/language/studying ancient greek/volunteering/whatever. One useful question is to ask yourself, if you won the lottery jackpot - what would you choose to do with your time? Be true to your inherent values and choose the life you really want not the one you think you should want.
Also consider "only boring people get bored" (a favourite phrase of my father that has stayed with me).
Sorry I think I got a bit carried away there!