It's understandable to be nervous. GenChem, in my opinion, is actually harder than Ochem and serves a bigger (but less dramatic) role in "weeding" premeds out.
The concepts are relatively new (unless you took AP Chem), most of the stuff is pretty uninteresting and not really applicable to your life, some concepts like hybridization, wave functions, space filling, ect. go over your head because you don't have any background for the information besides "this is an atom it consists of 3 different parts: a proton, an....."
The later part of Gchem is actually pretty cool...galvanic cells, real life redox reactions, Acid/Base chemistry...stuff like that
But some of the stuff is vital to being successful in ochem, which can make or break your sGPA/MCAT. Hybridization, for example has been used in every single ochem lecture and without the knowledge from Chem 1A, everyone would have been lost.
Be intimidated, learn the concepts and equations (a lot of Gchem is empirical), don't rely on your classmates...they are idiots and know relatively little..talk to ppl who have taken the class before and "get the big picture"
it's not exactly tough...but it's new so it's not easy either.