Love doesn't make you more comfortable; in fact, by design it tends, over time, to make you less comfortable (see Jean-Paul "hell is other people" Sartre). It just amplifies whatever you already have. If you think you have generalized anxiety disorder now, just wait until you're married.

Marriage not only gives you more of what you already have, it tends to give you a few things you didn't have, like children and a mortgage. Marriage can be wonderful (or hideous), but it will not solve your problems or make you happy. You can only do that for yourself.

I don't know if it exists or not, but you sound really depressed. I have depression myself, although after years of counseling, meds & some huge life changes I'm doing pretty OK. So I feel like I can recognize it in others pretty well. I hope you will take this advice & go to counseling or see a doctor. If you've already tried that & it didn't help, please consider a different sort of therapist. You don't have to be completely miserable even without finding real love.

It most definitely does exist. Though there are times for many of us , when it becomes quite illusive, and then there can be doubt of it's reality ...

It does, but it's extremely rare. If you're lucky enough to find it, you've found something more rare and valuable than diamonds. Most people just settle for something less out of fear of winding up alone.

It exists

No way: I love my dog, my mom, my deceased dad. I love live music,

Game over.

I know (possibly) why you would think that but it does, it just doesn't happen for everyone

That is wholly dependent upon what your expectations of "real love" are.
Expectations are usually what hang people up.