Completely brand new starter, cannot get kills

Hello!

I have just started to play LOL, like for maybe 3 days now. Played 2 days of tutorials and bots and felt pretty confident. Went into online games and I cannot get a kill. Like at all.

I try to clear waves with the last hit to boost xp and I can level up at a faster rate than my opponents but as I’m in top lane the isolation leads to a 1v1 constantly at around lvl 3/4 and I lose every time.

I started with garen which apparently everyone does but I liked a bit of range so I moved to urgot.

Most games I don’t get a kill, few assists but never kills.

Any help would be appreciated! Again I’m completely knew so any fancy terms may go right over my head :)