Really embarrassed by this, how should I handle it?

OMG you are so lucky to look young, trust me u will see this as a a massive advantage as u get older. Imagine when your 40 people will think your only 25!, it will be great ! my wife is 30 and sometimes she gets asked for id when buying booze and she sees it as a massive compliment ! you will never need to worry about cosmetic surgery to look younger !. U should consider it a blessing that u look younger than u actually are !!!