Should I even be in a relationship? If I feel like I am not ready or have a bad history, should it continue?

I'm a bad boyfriend. Period. Im immature because I only make time for myself and dont stick to plan. Im very sweet, according to her, but i just dont have my priorities straight when it comes to her. We have plans, ill make plans beforehand and then meet up with when she just wants me to myself on our date night, which is every monday. We constantly fight and bicker over the stupidest crap and its getting us nowhere. This isnt healthy and what im trying to get at here is when will i ever learn? Im 24, almost 25 i need to learn sometime, to treat a lady the way she wants to be treated, if only i could read their minds...people tell me to find a girl that relates to me, i guess im too laid back, but i make bad decisions when i date people, and everything that happens is my fault, im the bad guy, everytime. I just want to learn to treat my girlfriends right and be the best boyfriend and husband in the future. Should i keep dating this girl, is there any futurity with us? Advice please!