Hello Grim! I've actually experienced something similar :)
So adult teeth are all actually naturally wiggly! You're teeth are not actually connected to any bones, but they just sit in pockets in your gums, which are very fleshy and soft (to a degree) and are attached with tendons. That's why you rarely find any real (not fake ones or medical models) human skulls with many teeth! If I pressed/ tried to wiggle any of my teeth with my fingers, they will move a bit!
What seems to be happening is that you have become hyper-aware of this. Now that you've felt it, you can't NOT feel it, and after awhile you convince yourself that your tooth is becoming looser and looser. Trust me, I've done it SOOOO many times and been afraid that my adult teeth are falling out!
Chances are likely that there is nothing wrong, especially since you didn't mention any teeth pain, gum damage/ discoloration/ recession or infections, which are signs and symptoms of gum disease (the most common issue that causes adult teeth to loosen/ fall out). Excessive and chronic teeth grinding and jaw clenching can also sometimes cause your teeth to loosen, but it's pretty uncommon. You're just psyching yourself out! :)
If you truly are concerned, see a dentist, but I think you are just fine! Just make sure you are eating well and healthy, and that you're getting enough calcium for your teeth!! 
I hope this helped in someway. Best of luck!! :D
