Plz help!!! i think i may have social anxiety, i remembers one time i went to a store and there was a few?

people there, and i didn't no what was going on, i felt myself shaking, heart racing, so once i left, i just left it at that, but then when i was going for my road test, i noticed myself getting extremely nervous before the instructor even came, so once i got on the road i was nervous, but when i went to a mall, to do parking, i seen a lot of people coming out, and that really set me off, my heart raced, mt hands were shaking, and even buddy told me it's one thing to be nervous, but you are really nervous, and when i went back to the dmv, i felt like crying because i failed, also at a store, i would usually wait until i know when the store is not crowded,but if there is a lot of people in line behind i get nervous, and i finally went to a club for the first time in my life, and i was nervous even before going, so i went anyways, and when i reached to get a beer, i noticed my hand was shaking, but it was alright after that, because there was only a handful of people there.. then my friend said that i need to come down again when the dance floor was opened, and i said yea i will, but knowingly, in my mind i said no... when that night came, i made up that i was sick, and never did go