i've often felt the same way to the point of avoiding relationships bc i didn't want to hurt someone else while still being so totally uncertain and conflicting as to where my feelings really lied.
i think one of the problems with infj + infj is that, altho you can become extremely close, there is no introverted feeling in the relationship. we absorb and respond to the feelings of others, introverted feeling concentrates, sorts, weighs their feelings, most of all, coupled with Si, they KEEP them.
we don't nearly as much, we are use once and discard. the feelings change how we interpret things, they affect our intuition and sometimes drastically rework its landscape, but we don't have them accessible and they don't stick around like they do for introverted feelers like infps.
as a result it is very difficult for us to KNOW how we feel. i am 25 but i feel soooo immature, i'm just learning why partly due to this. i've just gotten invovled with an intj girl, and the whole thing is driven by her tertiary introverted feeling. she is pushing it, she is supplying the concentrated collected coalesced feeling to keep us together. whereas i help articulate it, express it, tease it out.
w/ other infjs it is very easy to trust them, but you're both inside out and don't know what is supposed to be directing you as a result. it's great bc you feel fully recognized, and it helps fulfill your needs, but problems remain that you have to contend with.
i think it is possible to stay friends, but you have to have other things on your plate in order for that to work. i think infjs share a very strong connection (all types who share dom functions do), but as a result you should look elsewhere to get your bearings, to get the information you need to slowly discern what you need/want, etc.