I relate very well to your description.
I've especially found it absolutely impossible to connect with anyone including my old friends. I'm pretty sure I know why I'm like this now, as I've spent countless hours in this state and analyzed it to bits. The only question that remains now is when will I decide to put myself back together.
Since socializing is difficult for you right now is there anything else that makes you passionate and gives your life meaning?
I ask this because it's entirely possible you've just been too passive in life and now find yourself a victim of circumstance. As you said you put others needs and comfort before yours but what else do you let in front of you?
I'm just ringing off ideas, but I suggest you take a look at yourself and decide what desires and needs aren't being fulfilled.
Just some thoughts, take care 25AndJustBeginning (I'm almost 25 too