Why are long-term relationships so hard to find, even though you want one in real life, yet you were lucky with online dating?

I haven't had much luck really meeting guys who share my interests. Most of the guys I did meet were either not interested in relationships or had girlfriends. That puts me off. I'm not a fan of tall guys. On shorter, I am. Other guys I did meet included my ex-boyfriend in person. My own knowledge of certain online dating. Dating with a disability has been wasted. I tried using Facebook for dating and got a little lucky when I messaged one guy after blocking another who had lead me on. I am aware that I am more unique than some girls or ladies. I'm not interested in having sex or hooking up. I'm aware that many men will take advantage of me or deceive me with ex-boyfriends in an effort to teach them a lesson the hard way and cause them to lose a respectable woman in the process.
Why are long-term relationships so hard to find, even though you want one in real life, yet you were lucky with online dating?
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