I just started myself as well, and after the first class, I figured out a few things.
First thing I figured, is Im quite abit stronger then the guys I roll with, BUT I try not to use the strength, instead I focus on the techniques I was taught. Sometimes I get caught up in the fun of rolling and "muscle" out of things when I should be using techniques, but generally I try to use technique.
Also at my first class I was kind of concerned about how good I was doing, how good I should be doing, etc, then one young guy told me, "man just relax, have fun, and try your best to learn the proper way to do shit. take it slow and practice". So I took his advice, and I really dont worry about "getting my ass kicked" Im the new guy, I SUCK right now!
Just have fun with it man, and try to learn the techniques. Im by no means any good at all, but it sure makes things alot more enjoyable not worrying about shit.
You should go back and thank your buddy(and yourself). Just that lesson is the most important one of them all in my opinion.
Almost everybody, me included, take ages to figure that out because people try to be nice or when they tell you you take it the wrong way because it is anoter white-belt telling you etc.
When you start using technique only you start realizing how many techniques you are missing so you get a lot to work on. Also you start having the mental power of being able to think whilst rolling. People who muscle stuff aren't thinking at all they are all caught up in the moment trying to win some abu dhabi final.