It feels like I spend most of my life drumming English words into my head.
It seems like I spend hours and hours drilling English words into my memory.
to drum into「叩き込む」を使っていうと、次のように言えます。
ーIt feels like I spend most of my life drumming English words into my head.
「人生のほとんどを英単語を頭に叩き込むのに費やしている気がする」
to drum English words into my head で「英単語を頭に叩き込む」と言えます。
または次のような言い方もできます。
ーIt seems like I spend hours and hours drilling English words into my memory.
「英単語を記憶に教え込むのに何時間も費やしているようだ」
to drill into で「叩き込む・教え込む」
ご参考まで！
I've spent most of my life drumming vocabulary into my head.
"単語を頭に叩き込む作業に人生のほとんどを費やしてる"
- I've spent most of my life drumming vocabulary into my head.
- I've wasted most of my life trying to drum words into my head.
- Most of my life has been spent trying to beat vocabulary into my skull.
カナダ 
アメリカ合衆国 
