It's normal that your 'fear' resets daily, especially if you're not a teen anymore, at the start of every session pretty much every muscle in your body needs to warm up before you can completely feel your board. If you play any instrument, it's really similar to grabbing it but then you have to fuck around for a few minutes in order to really get into the mental groove and feel like it's just an extension of your body vs. something foreign, skateboarding can also be like that except also paired up with the physical on a more intense level. Personal reference but I'm 33, been skating every day I got to since I was 12 and yet it takes me maybe 20/30 minutes of barely popping my board at the beginning of every session to fully start feeling my legs. Used to be shorter but I also think part of that is due to me becoming wiser with age as in more aware of what my body is telling me it can take, including during entire sessions on the occasional day I'll feel particularly off. I probably avoid a lot of potential injuries that way, but that's starting to read like the annoying little sticker warning you about how 'injury or death may result from improper use' on top of every other new skate deck these days until you peel it off to grip it.
Goes without saying that the first thing you should prioritize in skating is learning how to fall, since by definition you'll be falling a lot but as you're saying it doesn't have to hurt. If you've ever done or seen some judo, tucking into a ball and rolling forwards over your shoulder upon impact exactly like that is the most efficient way to break a fall (on flat at least) without extending a limb and risking breaking something. Times when you slip out backwards are tougher to predict but learning how to absorb your landings in general (by compressing your legs) will teach you how to lower your center of gravity less brutally in such situations and eventually you'll find yourself landing then progressively slipping out instead of straight up being launched backwards. Land as stiff as a matchstick man, break like one. I'm not even sure myself of what I do in those situations these days to be honest, I know I just try to land on a soft part of my body and will fall lying down so that the impact spreads (your back won't like you repeatedly landing hard sitting on your butt). Honestly I'd say just take five to ten minutes just once to learn how to fall on purpose tucking yourself into a ball and it should quickly become a habit (I think I remember 12-year-old me doing that).
The little laundry list of maneuvers you're describing is a lot of fun and that learning process is something you will actually cherish looking back after some time skating, you just don't realize it yet. Also remember there are no rules in skateboarding despite some people's personal insecurities saying otherwise so if any maneuver comes to you and feels fun, feel free to do it as much as you please regardless of whether or not it's considered a trick according to the Overwhelmingly Serious Book On How To Properly Waste One's Time. If anything, the hardest phase to go through in skateboarding might be the first couple of months or years since you still need to figure it out, but you're still physically riding the skateboard in the process and so a lot of the trial and error can hurt, but as you become more skilled it gets easier and more meditative than complicated.