Have u tried the resources part of the forum. A lot of useful information there.
But all seriousness, it's going to happen regardless. If you regress in front of someone. Simply let them know that a past traumatic unknown event causes u to regress (or retreat) to a child like state which sometimes needs their help. Nothing embarrassing about it. It's a defensive mechanism to protect the victims fragile mind.
All in all. I found that things like music, chew toys/necklaces. But everyone is different and have unique personalities. I tend to regress to music as well because music can change moods.
Maybe practice at home in a safe location. Becareful because u may not regress back as easily as most littles that do it for therapeutic effect it has on the mind.
I hope this helps but keep in mind that there is no easy answer for u. U have to discover your little self. It's part of u and most likely will be for the rest of your life. Friends don't except that. Then they are not ur friends. Same for family really.
Take care now. Feel free to start a chat or private message if u wanna talk. I'm always on.