Well one thing i would suggest , swap that teleport u keep taking for mid for some defensive tool like barrier and exhaust. Teleport mid is used in high elo, high team plays, where everyone knows u will tp and fights will be based arround those. And invest in Zhonya, not only in offensive items. I checked your match history and when u were taking Ignite/Exhaust/Barrier, u always had nice scores with little deaths. AS soon as u started taking tp, u started having alot of deaths.
I know u didnt ask for tips, just wanted to help. About tilting, what help is practice, think what you did wrong, join some normals and try to improve those things. That way u will become more confident in things you are doing.