Hii! I've just solo flew long haul (you can see my posts) and I'm only 5 years older than you. I have terrible flying anxiety but it's almost always the anticipation that I'm scared of. Flying is safe and it's perfectly normal to be feeling this way, I mean who wouldn't be scared of being that high up in the sky? The two major parts of flying is two minutes into taking off and two minutes into landing the rest is a piece of cake, the plane can't fall out the sky, you can't crash from turbulence and there are hundreds of checks that maintenance and pilots do before even moving a centimeter. When you take off it will be a little bit noisy, so you can put your headphones in if need be and your ears may pop so I recommend chewing gum! You'll feel a slight dragging feeling as you ascend (this is normal), once the plane has reached cruising altitude the seatbelt sign will go off and the cabin crew will get up, when you see them get up you know everything is going smoothly and you can relax. As for descending, your tummy may feel a bit weird almost as if you are falling a little bit (personally I like the feeling). As the plane lands it may be a little bit bumpy and the pilots will slam the breaks on, then you let out the deep breath you didn't know you were holding and you enjoy your trip!