why does this happen? need advise

I'm in bronze 4. I pretty sure most of you will dismiss what I have to say after hearing that. However, I'm looking for real advice so hold your 's. I go through this cycle of convincing myself that I won't tilt after losses because it doesnt do anything to help me, only to get to my promos, lose hard, and when I try to get back to them I start running into the worst trolls/players I have ever seen in my life. This cycle never ends. It is so demoralizing because of how much time I actually put into the game. Most of my friends are Gold - Diamond, I play norms with them all the time and do fine. I want to play with competent teammates and get out of this terrible elo. Rarely do I have a really bad game and rarely am I directly the cause for our team's loss. Meaning I go positive or break even most of the time. I'm playing jungle and adc right now but when I get out of hell I plan on switching to support. (can carry out of bronze with support) What do I do? Do I need to find someone to duo with? Or do I just have to carry that much harder?