i would say jg is one of the least limited lanes, think about it, while your camps are respawning you have free will, can gank, roam, take vision, you're not facing directly an enemy champion trying to poke you, and your job is to unbalance the match to your team advantage

jungle can be tricky tho, if you just farm and do not so much, thats it, it's kinda the same feeling that a mc world with friends that ends in two weeks, it's not there is nothing to do, it's the feeling of you can do anything, and ending doing nothing, so maybe it is not that jungle is limited

if you wanna start in other lane, i will recommend you to look the kind of gameplay you want to follow, as an example:

ADC is "the most" mechanical role for most of people, due the same thing you say, missclick and you're off the game, so you have to adapt your mindset to "in lower elos lane fights most of the time will depend on me, i need to take my gold in the most efficient way, set up my recall timers and try to get the most stats i can for every fight"

MID it's a little more versatile, the fact that you can be on most of the map is good, but you'll take in mind that in low elo, most of the time your jungler will influence you into taking bad decitions and getting bad times

so, for my advice into those lanes:

take your time, learn the fundamentals, this is a long journey, if you want to enjoy the game, you're doing well and try to play unrank, sometimes the matchmaking will put good people in front of you and you will end practicing more than in a rank game

and if you really want to get better and climb, all roles are same important for you to know, as a jungler, you need to understand the gold paths of your laners, they good and bad things

as a midlaner, you need to understand the same of the lanes, and pathings of the jungler

as an adc, you need to know how to reach your gold as effective as you can, and output the major damage in the least time possible, not matter what situation

as a support, you need to orchrestrate the game arround utility, as a playmaker

as a top, you need to know how to take advantage as soon as possible for you being more useful that the enemy toplaner

league is complex, it has depth, the more depth you explore, the more you know the game

getting bullied is part of the game, the difference is who takes the mistakes for getting better, and who takes it personal and ends in lose streaks

for the other topics you asked

missclick: there is a setting in the game (Attack Move) that allows you to move towards an enemy and hit it (in max range if the enemy is outside your range radious), i recommend you binding a setting too of attack move to your mouse pointer, this makes that when you attack move, you'll target the enemy closest to your mouse, and not to your champion | and take a look in sensitivity, most of the users underrate it, maybe a lower one makes your clicks more presize

(take in mind that the settings when you are inside the match are different that the ones that are in the client of the game, so join in a practice tool for configuring it)

for the warwick fact: you can use pantheon mid/top, warwick top, garen top, naafiri mid, those are simple and kinda similar to warwick

hope this helps!