Lately, I am unable to think and talk clearly. What could be the reason?

Hello doctor,

I am a 20 year old male. I have had speech difficulties since I was a kid. Now, it has progressed, and it is hard to say what I am thinking. I tend to have slow speech and thinking. Of late, it has been getting worse. I have to carefully think of what to say when I talk. I feel like my mouth cannot connect to my brain. I know exactly what I want to say, but when I actually try to say it, it comes out slow and unclear. My relationship with my dad is deteriorating due to this. I seem distant and absent. When he tries to talk to me, I find it hard to pay attention and it has caused me to be completely quiet. I find isolation to be relaxing. I hate this personality of mine because it can cause an anger outburst as I cannot express myself clearly. All this terrifies me. I am not sure if it is Asperger syndrome or because of head trauma. Please help me. I am not sure who I am anymore. I do not have a defined personality. I weigh 260 pounds. I work 50 plus hours a week. I am a very hard worker. I recently got health insurance at work. I played football for four years. I believe that I have a mental disorder and would appreciate help in identifying what it could be.