skillful, dexterous

good at

utattemita, a class of music where 歌(うた)い手(て) (utaite, “amateur singers”) cover songs

past of 歌ってみる (utatte miru, “to try to sing”): tried to sing

(figuratively, uncommon, possibly archaic) describes a state of having few visitors, of being lonesome, desolate, or unpopular, especially in business

everything

(colloquial) current boyfriend

(slang) Alternative form of 彼氏 (kareshi, “boyfriend”)

everyone, one and all

What you like to do, you will do well. To improve your skills in something, you must enjoy doing it.