Skitty the only way to get better is to practice! Practice practice practice! Find songs that you like the sound of then just get a tab or something and learn it, never giving up! Learning and getting good at an instrument takes a lot of dedication.
I'd play music with you if you asked, obvs not good enough
I think I'm mostly self-taught on the string bass, though I do need to ask where my fingers go for certain places in 3rd position and the space between my fingers for them. Wish I could actually haul the school bass at home so I can practice, but it's too big for me to take on the bus, and a bit too fragile for me to be carrying it around the school too. Darned huge things.
I also had no one to teach me the bass; no lessons and stuff, maybe that's why I fail as well. You play the bass in your band? I've never used a bass-only tuner, so I dunno how it looks like. Is it that different from a guitar?
I don't know myself, because I usually have to have my director help me with the tuning. Actually, I don't know if we have one too... I guess a normal tuner would work okay with it if you're using the electric bass and the line for it... Might have to try it out someday. :0