Is it odd that I haven't been romantically in love with anyone before? I've had relationships but I never fell in love with any of them.

No. There's nothing wrong with you, it's just that some people fall in love differently than others. Sometimes it's hard. Sometimes it's too easy. Sometimes it doesn't happen at all. And that's ok.

Don't put pressure on yourself to fall for someone or feel like you're weird just because that's what is "supposed" to happen. It's not all it's cracked up to be.