Is it normal if i think i'm socially challenged?

Idk if its social anxiety or mentally challenged. So I've combined the two and come up with socially challenged. I'm so normal and calmed by myself or around my parents and I feel like I'm ready to face the world. But I'm so wrong. I'm 22 btw. I just socialize and it's seriously challenge. Once someone, especially someone I don't know, starts talking to me, it gets so awkward. It's a challenge for me to continue a conversation without it sounding like a script. I wish everything was like a movie where we had scripts and the plot and knew what was going to happen and that's it, the end. But it's not like that. Everything is unexpected and you have to think right on your feet about what to say next. People just naturally socialize and take it for granted while me, it's a battle against not coming off as awkward. It's pretty hella annoying because I know I'm a down to earth person but this disorder just takes over once I'm out in public. I try to play it kool but eventually a challenge appears and the end. The worst part of this is in terms of the work field. I am an airhead and so I can come off as reserved because I don't want to do anything stupid but when it comes to work, I have no choice and I can look like an idiot at the most simple tasks. I want to learn how to make a joke out of it like I see many people do and move on. But I feel for me, it just doesn't go down. Its coming down to I want to work a field where I don't have to deal with people yet still have a high-middle class life, at least. I hope its possible because you know how they say you can't fix crazy? Well you certainly can't and you can't fix stupid either. So I have to find a comfort zone to feel like I can be me without feeling that social anxiety...jeeeze its sucha pain. Only those who have it know what I'm talking about. It might not seem like a big deal but to us, gawddd its sucha hassle. I'm over it.