Yeah.  I have a girlfriend and I can't call her because my mind goes completely blank during our conversations and they're extremely awkward.  So we text throughout the day.  Usually the best I can do is ask a couple questions, e.g. How was your day?, What was that like?, and then I can think of nothing to say.  When I do respond, its usually weird and formal sounding because I've sort of forced it out and perfected it, and I freak out about her responses because I perceive them to be negative.  I resort to ignoring her messages completely to avoid this problem.  I usually just lie and say that I was caught up at my job and couldn't respond.  Ignoring her makes it so that she is the one to create a new topic of conversation so I don't have to.  I've developed an anxious-avoidant response to her texts-when I'm not getting them, I really wish I was, but when I get them, I'm afraid to read them because I fear I won't be able to respond in a good way, and I usually end up ignoring them.