How do I become less awkward!? It’s really interfering with my professional life.

I am so awkward to talk to. I don’t pick up on social queues at all. I’m 33 and just have not learned how to have a normal conversation with someone. Tonight a guy came up to me that I was in class with previously and asked how I was, I then proceeded to tell him it’s bad he doesn’t know what grade his kid is in but I didn’t mean it. It just came out in a non joking way because I don’t know how to be humorous at all. He took it wrong, I think. Then the the day I was at a LEGO store and overheard a lady talking about turtles, I’m obsessed with turtles so I went over to her and apparently started just rambling on and on and didn’t understand she was not into it. I only know this because the person I was with came up to me and kindly took me away and explained how that was awkward and explained her body language to me. I had zero clue. Don’t get me started with professional settings. I have no idea how to interact with people in my profession and be on their level. It honestly makes me feel like I truly don’t belong. I need help being less difficult to talk to and less weird. I don’t know where to start.