I am dating a perfect guy, who i find attractive and who ticks off everything on my list. however as it gets more serious i am getting more and more afraid of committing to him because i feel like there might be someone more perfect out there who i am meant to be with instead. does this happen to anyone else?

i've had the exact same thoughts you have..
but you never know what you have until you lose it, and that's advice that i took from some people.
And if hes everything that your looking for ..
Go for him or you'll miss your chance.
Harsh but true.
It's like when you google a question, you get the answer and you can work with it but you still search for a better answer although you already have all that you need.