body discoloration?

so ive delt with body discoloration since forever i have dark armpits, inner thighs, and a little bit on my elbows. ive tried everything fom baking soda to an orange soap (kojic acid) im still using the soap bc i read it takes time for results. its so embarrassing because i want to wear tank tops so badly to show off my arm muscles 💪🏼 has anyone delt with this? pls heellp!!!