How to Say "My friend bought a new dress. So she feels good." in Korean?

"My friend bought a new dress. So she feels good." in Korean is 새 드레스 샀어요. 그래서 기분 좋아요. (sae deureseu sasseoyo geuraeseo gibun joayo)

힘들어요. (himdeureoyo) - It's hard.
영어 공부 힘들어요. (yeongeo gongbu himdeureoyo) - Studying English is hard.
영어 공부 너무 힘들어요. 그래서 기분 안 좋아요. (yeongeo gongbu neomu himdeureoyo geuraeseo gibun an joayo) - Studying English is so hard. So I'm in a bad mood.
쇼핑할 때 너무 힘들어요. (syopinghal ttae neomu himdeureoyo) - Shopping is so tiring.
지하철역 (jihacheoryeok) - Subway Station
지하철역에 사람 너무 많아요. (jihacheoryeoge saram neomu manayo) - There are too many people at the subway station.
사람 많아요. 그래서 기분 안 좋아요. (saram manayo geuraeseo gibun an joayo) - There are a lot of people. So I'm in a bad mood.
지하철 탈 때 (jihacheol tal ttae) - When I take the subway