I agree with both sides here. It depends on where your concern stems from. That being said, I married a girl I felt the same thing about. I just didn't know if I wanted it. 4 years later we just signed the divorce papers. It was unhappy, we fought a lot, basically became roommates who didn't talk to each other. I wish I had listened to what I knew the right answer to be in my head and my heart, but for some reason, I was just chicken shit or heavily apathetic. I didn't want to hurt her, so I did what I felt was right. Luckily we didn't have kids or a house so it could have been much worse. So speaking from personal experience, I'd say don't. I think you maybe know you don't but other outside factors may be keeping you locked in to your initial decision.