Persistent problem. Such talents in me?

Hello doctor, I am 25 years old male, since my childhood I had a problem of being introvert and shy but as it progressed things were turning out to be better for me, but again the I am suffering from same problem that is, talking to others and I always feel my mind is blank, I understand things a bit late as compared to others, I work in an mnc and where we deal with our client issues, the problem is I've to read thrice to understand the issue where my colleague understand wen they read once, the main problem is I find other people who are very good at conversation and jovial by nature, I am not and people like this nature, why I can't be? When I interact I struggle to respond in a better way or Perfect or funny way.. Why? When other can be perfect in conversation why can't I? What am I lacking? I too want to be conversational and jovial with qualities but I fail is there a way I can overcome and develop such talents in me? This is really causing me a lot of problems in my life.. :( :(