Is this unhappiness with the job

I have a question or maybe someone can give me KIND advice. Recently I’ve noticed I’m not enjoying my job anymore which I had previously as a “teller” I’m thankful to have a job but it’s like everytime I’m helping out someone I am just not happy. Or just over it! Is this a sign that I should find another job or what?? I do like my manager. And I’m full time. I just don’t know.