Yes I dabbled with these just for fun years ago. I stopped after about 2 months for a couple of reasons. 1, alot of the sites I discovered use fake profiles. It didn't take long to figure this out. But the people that put up the sites will take pics of beautiful model types and put fake profiles up. They use automatic email response so if you contact one of the fake ones, youll get an auto reply like something generic like "hey nice profile."
There are a few reputable ones, Match.com is probably OK, but it wouldn't surprise me if all of these sites had a certain number of fake profiles on them. I never tried eharmony, but it sounds like they maybe OK. Just remember with these, if they look too good to be true they probably are.
As a female you may have better luck, because
there tend to be a lot more men on these sites than quality women, so you'll have that advantage.
Also there are probably a fair number of whackos on those sites so be careful.
I did find a handful of girls that I almost made dates with, but blew it off because I ended up hooking up with my current SO shortly afterwards. Good luck and stay safe.