I'm really bad with people who have loud voices. In fact, I can't stand them. When I hear them speak, I get a major headache.
I wonder if these people don't realize how loud their voices are.
ご質問ありがとうございます。
"I'm really bad with people who have loud voices."＝「私は声が大きい人は本当に苦手です。」
"In fact, I can't stand them."＝「実は、そのような人が耐えられません。」
"When I hear them speak, I get a major headache."＝「その人たちが話すのを聞くと、頭がガンガンします。」
"I wonder if these people don't realize how loud their voices are."＝「その人たちは自分の声が大きいということに気が付かないのでしょうか。」
ご参考までに。
I'm not good with people with loud voices. My head starts pounding. Do they not realize?
"声が大きい人が苦手。頭ががんがんする。本人気づかないの？"
- I'm not good with people with loud voices. My head starts pounding. Do they not realize?
- I'm bad with people who have loud voices. They make my head hurt. Do they not realize how loud they are?
私は声の大きな人が苦手、というか大嫌いです。聞いていると、頭ががんがんする（痛くなる）。本人は自分の声が大きことに気が付かないんだろうか？
- I'm not good with people who have loud voices. In fact, I hate them. When I listen to them, my head starts to pound. Do they not realize just how loud their voices are?
アメリカ合衆国 
