IS IT REALLY HARD TO ADD ME ON THE STUDY GROUP!??

*sigh* yesterday I'd just notice that I'm not in the study group and I told my friend to add me on the study group but they say they not admin and I said to them to Ask the teacher to give me the group link and then they say there's no group link?!! I MEAN WHAT!? Just click the invite via link and copy it!!? It's is really hard? And the next day they told me that I already in the group but I said "huh? What r u talking abt? There's no notification from the group" and i chat my teacher to add me to the group n the teacher said i'm already in the group!! N then I realized that my sister number and that's not me n I said that's not me that's my sis number but the teacher say that was my number.....and then one of my friend told me "why you you had same pfp with ur sis?" What??!! I mean my pfp is sangwoo and my sis pfp is nezuko :v they not same right...