Push too hard in what way? Push for what?
Defeatist about what?
What are your expectations of friends?
What do you think are their expectations of friends?
I think the starting point is pinning down exactly what happens, exactly what it is you think you're doing that's offputting, and why (why you do it with friends, and why they might find it offputting.) I wouldn't assume those answers are obvious because of PTSD. I'd suggest describing what's going on in more detail, to understand it better.