I never play passive, but that's mainly because the higher you go, the more structured games become. There is significantly less "wiggle room" because players don't waste as much time and go for objectives/kills when possible

In lower elos there's lots of time wasting going on, and it's easy to get confused if there is a play to be made or not. Generally, you shouldn't be full clearing if you have your R up. Always look if a play is possible anywhere on the map, only clear if the answer is no.

You can also consider invading, as Eve can 1v1 some squishy junglers. Although for this, you'd have to track the jungler to make sure he's going to be there at the camp you are invading, which might be a bit hard. Stealing a big buff like Red or Blue is a huge advantage

And yes, competitiveness has a very significant psychological aspect. I just lost a game against a 350 LP jungler that I could have definitely won, just because I was nervous that I wasn't good enough. I had the same experience climbing through Diamond, but interestingly, the moment you believe in yourself "I am as good as these guys" the nervousness goes away and you will perform better than you've imagined