That is definitely some of the hoops you have to jump through when it comes to meeting people. I think right now you feel like it is getting in the way because even though you have a good time with them you are being realistic (which is good) about how invested you really are in them.
You have already told us about some of the hesitations you have, and those are in your mind aside from "me time" which is also really really important. I am not sure if you are used to being single and really enjoy your own time, or if you just really like the idea of having a girl. That's something up to you to figure out.
It's been a little over 2 weeks since you posted this, how many times have you hung out now? I kinda think at this point (if you have hung out with them a couple times) if you aren't really into either of them, maybe you should think about cutting it off. No one wants to be strung along for something that's really not there ya know?
It kinda sucks letting it go, but if there is no spark there is no point in forcing it, cause that sucks way worse. The only other way I can think of another outcome is if you tell them, you want a really low stress/casual relationship kinda deal.