You know better now than you did before, but that doesn't mean you were totally mistaken in the past. It just means you had some learning to do. Growth is a natural part of life, so don't discount it. You're starting to see things differently.
Were you tossed into the unknown today? Instead of shying away from it, head into things full throttle. Try new things. Experiment. The environment may not be as hostile as you think, but you have to keep an open mind.