Trying to improve

Hey everyone. Hopefully I can get some much needed advice here. I'm a fairly new player who is rank 34 and have been busting my butt trying to actually make the most of the game, but it has started to feel pretty hopeless considering how I get treated in about 70% of matches.

I have spent most my time finding champs I like, finding which roles I prefer (tried all the lanes), and learning about the basics as much as I can through watching video guides (dozens of hours worth) and friends play. Unfortunately no matter how much effort I feel I put in, I feel pretty useless. I ended up deciding on jungle, I actually really like the role and the way it is set up and how it works overall, but even though I'm trying my best, it doesn't prevent me from being yelled at for not ganking an overfed Garen in top lane that's 3-4 levels above me, or for jumping into a 1v4 on my own when I see that our team bot is about to die but there's no way I'd make it there in time, or from getting counter jungled so hard that it really shows how inexperienced I am. While there are ways in game to deal with someone treating me like I'm a bug under their shoe, there really isn't a way for me to deal with people who have 100s upon 100s of more games than I do and know the insides and outs of everything.

I WANT to get better, I WANT to improve, but I feel completely stuck. I don't know what to do anymore and so here I am, trying to get some support and get better. While I have one friend who's a jungle main and has taught me about pathing, vision placement, and when to take ganking opportunities... I'm kind of hoping I can find even more insight that maybe he hasn't taught me and I can continue to get better.

Any help is greatly appreciated. Thank you for your time.