Not sure if anyone mentioned this, but why not ask the guy in the band what he meant by "feel." It might sound stupid, but there's a lot of subjectivity, even among people contributing to the thread here. That's not really a bad thing in this context, because there's really some good insight into playing with others. But the person you really need to ask is the guy who gave you the feedback in the first place.
FWIW, I tend to equate "feel" with words like groove and the idea of playing in the pocket. Two people can play the same notes at the same tempo and play with a completely different feel. I'd guess "finesse" and "nuance" may be words used to explain the differences.
To echo other posts, the more you play, the closer you'll get to feeling more competent and comfortable. It will come with time and experience. It's good that you're thinking about your playing and asking for feedback. If you get the opportunity, ask the people you play with to get more insight.
FWIW, I tend to equate "feel" with words like groove and the idea of playing in the pocket. Two people can play the same notes at the same tempo and play with a completely different feel. I'd guess "finesse" and "nuance" may be words used to explain the differences.
To echo other posts, the more you play, the closer you'll get to feeling more competent and comfortable. It will come with time and experience. It's good that you're thinking about your playing and asking for feedback. If you get the opportunity, ask the people you play with to get more insight.