I'm scared of initiating a team fight
This is only when I'm playing champions like Shyvana and Sejuani. I always feel like I'm going to be the first to die even though I'm building quite tanky. Whenever I do initiate, I try to rush towards the squishiest champ, usually the adc or their mid, whichever is more dangerous. However, usually when I do this I die while my team dies behind me.
Now, not to say that I never win team fights. I have done some good work in team fights, I've even gotten a quadra kill, however that was when someone else initiated.