Two 15 minutes presentation this week

Two 15 minutes presentation this week I have to give two 15 minute presentation in this week , and i stutter but nobody in class no i Stutter,i have given 5 minutes presentation before, i am able to hide my Stutter in that,like i speak very slow pitch , i have not seen face of any person just see the camera as teacher was recording it, teacher was nice ,like whenever that teacher see me he always say me , don't be afraid,try to say loudly . But 15 minutes is too much like i don't have speaking stamina to do so, earlier too you guys said me to tell everyone about your stutter don't hide it, but it difficult i don't want to do it, i am very private person,i don't want to expose my friend, but still what to loose , i still don't have any friends ,i don't initiate talk with anyone,like what worst can happen