My farm is decent, counting that i usually fight against ranged champs and i usually pick diana into mid
No, it's really not. If you want to get better you need to focus on cs more than just trying to get a kill. Think about cs as your main objective in the game, thats how important it is.
If the laner fed by the time i roam, i wont roam, high chances ill get killed
This is exactly why you lose games. I play top, and whenever I see bot lane getting pushed by the enemy, I will always tp behind them and kill them. 3>2 when youre doing good yourself. And in bronze elo, everyone has bad farm. I just got done ranking up a bronze account to diamond, in bronze Id have 94 cs at the 11 minute mark while everyone else was around 34-70. Bot lane would always be the lowest because they focus on harassing too much. When in reality 15 cs = 1 kill.
So lets say theyre 4-0 bot with 50 cs, and I have 94 cs and im 0-0-0. I would be behind by a whole 16 gold, but I am also playing a lane where I dont have to share level experiece with my support. So I will likely be 2 levels above them, allowing me to deal tons more damage than their few extra gold would.
So now I go and tp bot, I get the enemy ADC to low health, let my adc get the kill, kill the support as well if I can. Then I push bot's lane to the enemy tower to deny any cs their team could get. After that gank, bot should be back to normal, and if they decide to feed again, then gank more.
I always have mana, i usually dont leave lane till im like level 10 if i havent been ganked or any
Not leaving lane till level 10 as a mid laner is bad. You always want to be looking for roams. Just a simple basic attack to an enemy laner can make them miss 5 cs. When I play mid, I push lane to tower at level 5, roam top/bot (whoever is pushed towards our tower the most), then I use my abilities on them, back, and repeat. I do it over and over until everyone starts grouping. I dont miss any farm, and I am making play elsewhere on the map.
Well, i wish i could, but when im 4/0 by minute 15 i.e, I jsut get camped, and my lanes dont snowball, so they camp the carry, while the other lanes feed... gg
You're not warding properly then and not using your advantage. And if theyre camping the carry, then theyre doing what theyre suppose to be doing. That's the teams job to stop you from ruining their game mid/late game because of how fed you are. You should have wards in the enemy's jungle at all times to know where the jungler is. If you have no vision of the enemy jungler, then you should not be pushing lane so far. Once you see the enemy jungler is at blue/red, then you can push your lane. If the enemy jungler is going top/bot, go gank to counter his gank.