So many things.

I remember whenever the person behind the counter at subway asked what I wanted for my salad, meat, bread, ect. I would always answer with "errrrr...my answer" even tho I knew exactly what i wanted. I remember noticing it and trying to stop it the next time but it just happened automatically with the next reply. It was like I somehow wanted to seem unsure about my answer. This didn't get much better when I worked there :/.

The absolute inability to keep eye contact with anyone who is not very close to me. I just automatically look away at any lock and it's fucking infuriating. I can't seem to stop myself doing it.

Blanks. Asked to remember something on the spot by someone I just stutter and forget and try to make a plausible answer out of scraps of memory.

The inability to add to a conversation with anyone that is not close to me. Every answer is short and I just don't want to talk. Unlike normal human beings when a subject matter finishes I can't ducking continue it even if I have a relevant story to add, information to give, ect. This is just multiplied when you add more people and it sucks.

I noticed his problem that I have and I do my best to fix it now. Step out there and be the one starting the conversation for once. Just a friendly greeting to people as often as possible can be an easy way to rid yourself of this. I feel a lot more comfortable when I have control of the conversation's subject and participants.

If i am caught of guard I usually ask for them to repeat because I misheard even though I perfectly understood he question and are just formulating my answer.

Tell jokes and if you think of something add it. It's what I do regularly with my friends I don't think it just flows so I translated this to others. When you're comfortable you speak without thinking, if you can manage to do this for others, you'll be a much more confident speaker.

Confrontation is something most socially awkward people avoid at all times myself included, but sometimes it's necessary. I think out the consequences of what I'm about to do and usually the good far outweigh the bad. Don't let something keep negatively impacting you if you can just stop it with communication.

I still hate talking to people but I've managed to change a few things to make it not show so easily and not negatively affect me anymore.