Why I dont support and why I tell my teammates I am incapable of doing so

Leona is the only support I like to play and when I do play her I catch Leesyndrome. I will 1v5 if I land my gap closer (im not going to even attempt to spell the skillshots name), why? because I feel like a god when I hit W, and then when I die and I see my team mates did not go in to fight when I did, it puts me on tilt. Also im an extremely aggressive support so It pisses me off when I have a graves adc and he plays like a pussy. If I have to play support you will just have to understand that when you choose me to support, you signed up for whatever is about to happen so don't get mad get glad [:

I will support, however, you better be a really damn good ADC and carry my ass lol