If you live in the US, be really careful about this situation. Not only you told other people you are taking underage girls drinking but even worse you stated it online for everyone to see and have a record of. So make sure you know the laws in the country you live in before mixing underage girls and alcohol/sex.
Now regarding your concern. Simple: Date in private.
There is absolutely no need for people to know who you date or don't date. You don't need approval. Yes, the age gap is not a problem, we agree. If you were, say 29+ then 19 is a stretch, not so much because of the gap but a man hits 30-35, we are talking about a theoretically matured man, so a 19 yr old girl isn't gonna cut it for him. But you are 24 so you are young and should get as much experience as possible. We would even recommend going for the 23-28 range.
Anyway, hope this helps. And again, be really careful about stuff like this.
Modern Man Advice