How can I be(come) less socially awkward or less shy ?

Hello everyone,

Just a little question for y'all, I'mma give out some context ;

I'm M21, and I know that I'm still like... Young and that life still has a lot to offer, however..

I, since middle school, made a little progress in that topic (for exemple, I'm able to call on the phone to make a doctors appointment, and so on (which was impossible several months ago)).

I got a little more self-confidence, but still not enough.

Problem being, is that... Like I'm almost like physically blocked when talking to people face to face. And I work in a store, with colleagues and customers, and so it quickly becomes a problem.

I guess that by the phone, I dont see the person, so its easier ?

Like... Even when I see someone my age, boy, girl, I cannot go further than "Hi, how are you" and end of the convo. Even if I would love to engage more, or abord a convo to like... Know the person a bit more (colleague). For instance, I'm too shy, or awkward, I guess, to abord that cute colleague.

But that can be applied to anyone, in all situations, especially when the person's in front of me.

So, do y'all have any advices ?

Thanks,

(Sorry for bad English, not my native language)