That's really sweet. I'm sorry I came off dubious. I feel like it's such a struggle to connect with people, and when it finally happens, it's like "Ok, they just got sick of watching me flail, so they decided to say something". I've really never been at such a low point in my life.
Where I am took a lot of practice. I do hundreds of takes, and I am constantly conscious that my problem is that I am feeling and playing the song as parts, but it's supposed to be done as one continuous statement. I was a kid of the sort where commentary about walking and chewing gum was pertinent, and I was terrible at sports, and they were always guaranteed humiliation. Except one time, I remember blocking someone at basketball, and it was someone else's turn to be told that their shot got "stuffed" by someone otherwise incompetent at sports ,and it was directed to them with much shame implied.
So, if you are playing guitar, you're doing something considerably different with each hand, and then attempting to sing over it, and it's really hard to get into a zone where it comes together whole. It takes a lot of practice, and I'm nowhere nearly done. I hear a lot of problems, and just because I came in at the right moment, doesn't mean the phrase closed where it was supposed to. I think this stuff is hard for everyone.
Someone else was commenting on how they seemed to notice me experience an epiphany playing the rhythm to Be Good, and I felt really good about that, because something about it clicked and it came out better than the other stuff I play, like something continuous, and not bunch of jerky bits glued together.
What you mention about singing loud, and throwing yourself into it is a different issue. I used to hang out at an open mic, and I never had the courage to finally play there, ever. But, before I left town, someone told me something magical that helped me a lot. He told me that the goal is to go up onstage and "jump out of your skin". We tend to expect a lot of technical analysis in order to do something better, but the spirit of music is not like that. You need to lean into it like you're taking a feeling and directly belting it out. I followed the "jump out of your skin" advice, and initially found that my voice was total trash and it was a horrible sound. I also found the range was really limited, so I spent a lot of time making horrible screeching noises until my range improved. You get around this awkward stage by practicing somewhere private, that way you're not inhibited by the fear of embarrassing yourself. It's only you that hears the experimental mess. If you play guitar, a capo is tremendously helpful for finding the proper pitch for your voice, because it makes a huge difference. I usually find there's maybe one half-step of give, at most, and everywhere else it sounds worse.
Also, I've found that a lot of the emotive effects that you hear in professional music can't even be done unless you're singing with commitment. It sounds really weak and affected if you're quiet, versus if you're screaming your heart out, it just comes out the way it's supposed to. The gravel in my voice is natural, I did not know that I could do it, and I thought people affected it. I'm just pushing myself, and it comes out that way, and I guess that's not surprising because I choose songs for how I actually feel.