That I'm pretty sure I've fallen for this girl I'm only mutual friends with, which I doubt is going to go anywhere.
h these kinds of things, it is actually pretty healthy for you to be thinking like that in the first place, just as long as it is not totally defeatist.
In the past i have fallen for a friend, who i had only gotten to know for a short time, and did not expect it when she got into me as well when i blurted out the fact when i was real drunk(i passed out right after, and she left my flat, we were to talk after the movie finished we were watching), but i blew it later on for many reason, one was that i was the opposite of you, i thought it was defo going to go somewhere once we spoke after that, and that, along with other factors(i was an alcoholic basically), killed it.
So, i would say try to find the middel ground between pessimism and optimism.
I have been reading your posts on movies, and you are a very smart interesting guy, she may well enjoy getting to know you and fall for you in the process, good luck.