Losing with a sick score

i usually win my lane as an ADC and i get farmed. winning my lane most of the time being active in teamfights. But around min 30 i stay int he base cause we get pushed as hell. Usually the enemy gets 2 inhibits and i stay at the base and deffing. My team are pushing and team fighting usually they lose. And i end up making a triple and they need to push but we lose and im with the score 17 3 at the end with all the veggies on my team. usually we get pushed cause i die 1 vs 4 in our base trying to defend. item build at the end of the game around 20 k gold and 250 minions scored. the worst is that im on a 6 losing streak and 5 out 6 im the best in the team. i would post a screenshot but i cant. I dont get it is it a curse??? Being the best and lose. Getting better results when losing than winning. The worst is if you die you lose then super feed cause you retards can defend the base. The worst is that i got reported by my team cause i died and they demolished our nexus.