r/band

yo so i just got into a band, and we're all still in school, cant decide on a song to play... I m the lead guitarist is what I'd say if i wasn't the only guitarist. i only have about 2 yrs self taught exp while my drummer is a god with about 10yrs exp and my singer/bassist? has 5yr singing exp and about 2 yrs bass exp. though idk if shes playing bass.. I'm not so sure if i want to keep on joining because i feel like I'm too inexperienced. the drummer guy.. i think he wants to make a living out of this.. i also do not know how to practice guitar effectively. All i do is search the song tab and if its hard i don't play. there must be a better way to do this? should i get guitar lessons or something..? help!