You care too much. Expect your team to lose lane every game, and don't expect them to do anything outside of lane. Expect either 40 minute laning or aram past 20 mins. Take this information, and make safe plays that guarantee safe results. take the safe route through the jungle, and make safe roams. Who gives a crap if botlanes 0/40, If you just stay neutral your teams gonna win 40% and the enemy will win 40% other times someone's making a difference.
You don't play consistently. It's hard to expect to play basketball well if you don't show up for practice daily, then show up to every game wearing cleats. You're at a disadvantage. It's like playing barbie dress up, but you left all your clothes at home. What are you expecting? Get some consistency going, and watch some streams.
You don't have much for ranked games played. That to me, is a red flag. You might not be a "Real" silver. Nothing wrong with that, it just means you lack the plays in your playbook for the some 200 different plays at the time. Focus on the basics, Nasus is great. CS, build a ZZ'rot and try and group with your team around 20 mins. Don't aram, or sit in lane too long.
Your main goal is improving, So every loss is a win if you focus on something and make it better. Even if it's minute.