- Yeah, a better computer would be advisable for VR.
I assume that, being an Alienware, you can overclock the CPU to around 3.9 or 4GHz. Just overclocking your CPU a little bit could drastically improve performance. (tricky manoeuvre, but if done conservatively, you can find the sweet spot between melting your PC and improving performance)
I would recommend waiting a bit for the newer cards like the RTX 3080 or the 3090 to become available and getting one of those. I am using an Oculus Rift S, which does the job and the price tag is half of a G2. I now have an RTX 2080 and it’s fine. I don’t get a lot of stutter and I can play any VR game close to full details.
- The disorientation and motion sickness that you will feel are temporary.
These are 2 things which need separate addressing.
The motion sickness is the worst. As Gayusbaldar and CodeLoran69 said, Don’t push it. My first time in VR was 2 minutes on, 2 minutes off. And no longer than an hour a day.
In a couple of weeks, I was able to handle 30 minutes sessions with 10 minutes breaks - getting a drink or just refocusing my eyes and sometimes cleaning the headset lens.
Almost a year in, I rarely feel any motion sickness. And when I do, I just do as you would in a real situation; Look at a different spot (still in VR) or close my eyes for a few seconds and it just goes away. And I can fly for hours at a time. Usually I realise I’ve overdone it when I put on my headset after lunch and take it off in complete darkness 
Given your age, at first, it will be a bit of a longer process. Play for 10 minutes rest for 20. But slowly but surely, you get used to it and start enjoying it to it’s full potential.
The second thing is the disorientation. That is expected and it’s not as bad as it seems.
It’s like you close your eyes in the living room and you open them on top of a skyscraper (and vice-versa). It will mess with your head a bit, and could be a risk of falling over if you’re not used to it and standing up.
But a lot of VR games can and, in the case of MSFS, are played sitting down. This will alleviate and almost remove any disorientation or dizziness and reduce the risk of injury to almost 0.
(Just as a funny story, I did forget I was in VR once and tried to rest my elbows on the instrument panel. You can guess that my keyboard didn’t know what hit it 
)
Respect the following rules and nothing bad is going to happen to you our your hardware:
a) Make sure there isn’t anything at arm’s length that you can hit or spill (walls, drinks or family heirlooms)
b) Sit down comfortably in a known environment (at your desk or on your couch)
c) If you get motion sickness, remove your headset and wait until you don’t feel sick anymore before putting it back on
d) Once you removed your headset, don’t stand up immediately. Stretch your arms and back and blink a bit longer. Take 30 seconds to a minute before standing up.