i can't win with pantheon :(

i get first blood and 5 kills before lvl 6 in top lane ( as pantheon ) i am very strong and powerful in early but after 15 minutes i lose my strength and i can't win! if a yasuo get 5 kills pre lvl 6 he will become a oneshot monster! but i can't 1 vs 2 with 9/0 score! i play on my friends home too and they can't win as pantheon too! what is wrong with pantheon!?? or me?? i even help my team with R and help team fights! pls tell me what i should do i really want to play pantheon and get early kills! i searched in google but there is no answers .{{champion:202}}
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