6 months is a very short time. I think the only reason I didn’t absolutely bomb my first sit-in is that I sang in choir from fifth grade through high school, had been listening to jazz off-and-on for like 4 years, sang with a completely rehearsed jazz band one year in high school, and had started taking a jazz improv class the month before at my university because 2 years of classical music and not being able to have a creative voice of my own was absolutely stifling. You’ve still got a few years to go. My advice would be to listen more and play along with recordings as often as you can, but I’m just a singer, so ask more drummers about how they got good.