Its not the norm. Mesh bodies, and the clothes that are rigged for them are so much more pleasant to look at than system/classic ones.
But like anything there can be a learning curve. Stick with it, try new things a little bit at a time and Im sure very soon you will be wondering how you ever made these mistakes.
Maybe head to a newbie learning center, like New Residents Island, they have tutorials on clothing there and often official helpers who can explain it all in person much better than I can over a forum.
Good luck, don't give up, it is worth it.