Good Team Makeup does not equal Win

This is a cautionary tale.

Movement, or the lack thereof

I finally overcame my fear of playing as Kassadin in an actual match and, while I did decently enough, it highlighted something that I have been noticing a lot recently: I am not terribly mobile.

If left to my own devices, I tend to stay in my lane. I like the lane. It feels like a safe place, even considering the 1 or more people there for the express purpose of killing me. I am aware that other members of my team are often involved in skirmishes over on the other side of the map. Sometimes I even think to myself, "things are looking rather rough over there, I should probably go and help". I think of an ideal route to take, and what combination of attacks would lead to the best ambush. I think and plan and consider all of the options available to me. And then I stay in my lane.

It feels like I'm watching the news. Teemo has just been cut down twice in a row by Xin Zhao. "Oh dear," I'll think, "someone should really go up there and help." There is no reason why that person should not be me, but I am noticing more and more that it never is. I think the core problem is probably being overly-cautious. I learned caution early on when playing LoL and it has served me well, but every now and then I play against someone much better than I am, and I will marvel at the ease with which they change lanes, yet always managing to avoid losing a tower. It's clear to me that the best thing for me to learn at this point is knowing when to leave my lane to assist my teammates or set up an ambush. The key looks to be understanding the flow of the game better, which I'm hoping will come with experience. What say you, chaps? Anyone have similar problems?