No, you don't. Unless you play a specific instrument that uses a specific clef or is a transposing instrument, most everything will be written in the Treble or Bass Clef, including singing.
I can share! I've actually been wondering if I should try to learn to read sheet music. I do a lot of singing, and thus a lot of staring at notes I can't read. I have really good pitch, I can sing a note if I can hear it, and I thought that if I can read the notes on the music it can help me figure out what to sing. I've never even touched a piano tho nor do I understand sheet music so I wanted to know if it was possible before I attempted anything
Oh yeah, that's more than doable. All you'd need is the Treble and Bass Clefs, and those are ubiquitous and easy to understand. If you want I can do a whole thing on reading sheet music.