Extremely disappointing matchs and players as of late

Since the start of preseason I have lost every game, whether it is from trolls, my inability to learn the new rune system because I was not able to get on PBE months in advance to learn everything, and have simply lost tons of money because riot basically changed the entire game. I am so angry now and the constant changes that keep occurring in this game is awful. Defend of the Ancients doesn't change this rapidly and yet players still go there and play at high levels while enjoying the match - this is not clearly happening here. Just why....