I’m a female bass player-singer too! I’m a contralto (look it up!) so lots of songs are a bit high for me. Not a problem! Just change the key. I’m a lot older than you and play mostly jazz and blues so I won’t suggest something that’s not your thing, except I’ve found that blues progressions make it easier to sing, ie: you learn to walk and chew gum at the same time much faster. Good luck!