My bass is dying soon!

Ya...tt's true..its dying soon. Went to Luthermusic today (saw pam and her dad there...wat a small world eh) to collect my bass. Tot everything is fine when i tried it out over there, using their amp. When i tried it at home, it's the same old problem again. The strings are vibrating so much that they touches the metal strips on the fretboard. Well, one of the Luthermusic staffs told me that the strings are so-called too powerful for my bass to handle. He suggested getting a thinner set of bass strings. Well, i'm still an amateur bassist and i have no idea wat he's talking about. think tomolo i have to see whether there's such thing as a thinner bass string anot when i go plaza singapura to search for it. Oh God, really pray that He will revive my bass again.