I can't fall in love?

In my entire life I only have ever had a crush on 2 different guys. And I honestly am not even sure if I actually had a real romantic crush on them. With the first guy I did have romantic feelings in the beginning, but after a while off I stopped liking him. The second guy was not even a real crush. I just can't catch feelings it feels like. I need to get to know someone really well before I even consider feelings. At times I do talk to guys where I'm like "omg i like them a lot!" But then after 2 days/weeks it's just gone and I realize that it was just a short obsession. That's the reason that right now, I first wait a few weeks before flirting too much, so I can get my feelings straight. I always have to figure out if it's just a small and short obsession or if I actually like the person, help?

Updates
8 mo
Hi guys! I have an update. I currently have a boyfriend and we've been going strong for 1,5 years already! So I can indeed fall in love :)
I can't fall in love?
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