Having Trouble Getting Past Bronze 2
Refer to op.gg, LoLKing, or Match History for stats
TL, DR: I make it into promos, but lose once as Lulu and, admittedly my fault/choice, dodge the next game because the Rengar who wanted top was going to support. Then I lose again - hard - as Lissandra. I'm told that my positioning is off as her. I'm also told that I tilt horribly after losing just once - not into toxicity, but as in "I focus too much on rank instead of having fun" tilt. When I was playing MTG, for example, the opinion was that I'm a very sore loser. But I'm also not interested in stopping from playing Ranked, nor do I want to have to learn complex champions, Insec mechanics/positioning, or make climbing to Gold more stressful than it can already get by min/maxing my actions and movements.
Without being a dick. Or telling me that my serious attempts to approach the issue are completely wrong and that I should uninstall. Or any advice that would incline me more to beating the next person who I perceive as being a dick in real life. Anything I should be doing in order to get to where I want to be with what I have? Or, according to my stats, do I need to play tens of hundreds of games with whoever I want to go up in rank with before even thinking of Ranked? Can anyone also explain the feeling of rapid BPM and chest constriction that I feel when losing or doing really poorly? Constructive comments and advice greatly appreciated.