The best thing you can do if you feel like you're missing context because of a lack of knowledge, is to educate yourself. Start learning more about popular topics. Read encyclopedias. Consider some general education classes at a community college or adult school.

If you think that you're missing context because your processing speed is too slow, then you can work on your mental reaction time. There are a lot of fun trivia games that you can play to get used to thinking and retrieving information faster. But the more familiar you are with a subject, the better you'll be at this. So, continuing your education will help here too.

If you think that your response time is impaired by anxiety, then you can work on overcoming social anxiety. This is probably best done with a professional, and outside my ability to advise upon. I do know that salespeople often talk through common objectives with themselves while looking in the mirror. So you can definitely find resources for getting comfortable with being uncomfortable in the salesmanship section of your local bookstore, or any number of sales seminars available in audio or video format.

Good luck to you! Identifying a problem is the first step to solving it, and you've already done that! Asking for help is often the hardest step and you've done that too! You've got this!