Are you in the US? If so it makes a bit of sense olif you want to “fit in” socially, but it’s also fine if you just likely the accent. If you don’t live in the US then it might seem bizarre to people if you switch up your english accent (whatever it currently is).

But it’s your life, you do what you want. Plenty of people have elocution lessons for various reasons. If you feel embarrassed for whatever reason then tell people you’re taking elocution lessons. You could tell them you’ve chosen an American accent as you like the sounds, or it helps you project confidence or even because you feel it will open doors for you when communicating with other English speakers as it will remove bias or prejudice against your current accent.

There are lots of ways of justifying it if you feel the need. But hopefully your friends and family will just understand if you say you just like the way it sounds.