Being able to go to college was the only thing that mattered to me because I couldn’t pick one thing that I wanted to study so I didn’t have the interest of studying in a specific major
Going to college was the biggest part for me, I don’t really care that much about my major because I wanted to study multiple things
最初の言い方は、Being able to go to college was the only thing that mattered to me because I couldn’t pick one thing that I wanted to study so I didn’t have the interest of studying in a specific major は、大学に行ければ学部はどこでも良かった、なぜなら、色々なことに興味があったので、そこまで特定の学部にこだわりがなかったと言う意味として使われていました。
二つ目の言い方は、Going to college was the biggest part for me, I don’t really care that much about my major because I wanted to study multiple things は、大学に行ければ学部はどこでも良かったと言う意味として使われています。
お役に立ちましたか？^ - ^
As long as I can go to XX University, I was happy to study in any of their departments/faculties.
この場合、次のような言い方ができますよ。
ーAs long as I could go to XX University, I was happy to study in any of their departments/faculties.
「XX大学に行けたら、どの学部で勉強するのでもよかった」
departments/faculties で「学部」と言えます。
ご参考まで！
アメリカ合衆国 
カナダ 
