USERNAMES??????? help and please read??please

okay so i made my snapchat when i was younger so my username is very kiddish and its kind of embarrassing when people ask for my snapchat and i have to give them my kiddish username. i want to make a new snapchat to make a better username but on the other hand i dont because i dont want to lose all my streaks and all my friends on there. is there any way you can make it so we can change our current username or even transfer our streaks and friends to our new snapchat if we make a new one? i dont know if this is possible but it would really help. please try to fix this??

i love this beauty app about Snapchat, v10.14.0.0