Whenever someone talks to me I don't have anything to say back to them. My mind is blank. I just smile or fake laugh or say "yeah" because I have nothing else to say. People get mad at me because I don't say more than one sentence at a time. I guess I can say I feel apathetic. This has been going on for a few months I can't even talk to my family because I don't have anything to say. For example if I'm talking to my mom or dad I probably only say one or two full sentences and that's it, I just laugh or say mmhmm or yeah because I don't know how to respond. WHAT'S WRONG WITH ME!?
If it helps, I have a hard time concentrating in general. I always forget words or what I was talking about. I have to reread things over and over again and I still can't comprehend what I read. When I talk to people I am comfortable around I still can't get what I want to say out. It feels like I drank 10 cups of coffee and I repeat words and I forget what I was saying and I get all jittery/excited...It's hard to explain. Also I use to always be too anxious to talk to people but now it's more like I get annoyed when I know people might talk to me. I just don't want to be around people.
If it helps, I have a hard time concentrating in general. I always forget words or what I was talking about. I have to reread things over and over again and I still can't comprehend what I read. When I talk to people I am comfortable around I still can't get what I want to say out. It feels like I drank 10 cups of coffee and I repeat words and I forget what I was saying and I get all jittery/excited...It's hard to explain. Also I use to always be too anxious to talk to people but now it's more like I get annoyed when I know people might talk to me. I just don't want to be around people.

I wouldn't worry too much about it. Don't think too much into it, and don't try too hard, because thats where you'll probably fumble. And to be quite honest with you, you're probably more of a deeper thinker, and thats why you have little to say, and don't respond as quickly as others. I mean, I know I usually have very little interest in the basic everyday 'small talk'. And I think thats why I kind of suck at it so much. I'm just not used to talking about such simple things. I'd rather skip all that and talk about more deeper things that have more meaning. Best wishes! :)
take a fresh grip on your bullet proof mask
and if they try to break down your disguise with their questions
you can hide hide hide
behind paranoid eyes
the lack of concentration though I think is a separate issue.