Any tips on surviving first year of h.s and making friends?

I have a feeling im not going to do good in h.s.The annoying thing is that its crowded and im 4.11.Short right.Im going to be hit by crowds and waves of ppl in halls.Second how do i find the room if i dont know where it is.Obviously h.s is serious.If your late in a class,on first day,they scold or whatever at you and say stuff like miss,i expect you to be on time.And u say,i got lost,srry.then they sey NO EXCUSE NOW FIND A SEAT.And ppl start laughin like jerks.Finally how can i make friends.All the people i knew are pretty much going to cardozo exept for like 8-11 ppl.How can i grow taller.Milk?I hate milk,so anything else TT_TT