You make mistakes and learn from them. I would refrain from doing it again, but don't beat yourself up about it now. It's the present, that was the past.
You were foolish. Hopefully you learned and will never do it again. If you were under age, you could both get in trouble for sending/having them on a device.
not at all. you did what you thought was right at the time based on your circumstances. nothing wrong in that. you did it, its over, time for you to move on and let this go.