So you say you don't want your boyfriend to find out? He will, trust me. Those photos of you are out there and I would say it's only a matter of time.
I'm glad your mother took the phone. I hope she keeps it. Do you even have an inkling of what sort of trouble you may have brought on you and your mom?
Do you care? Obviously you don't if you say you would do it again.
I don't think you are fifteen.. I think you're younger or at least you look younger in the picture you posted.
You need help young lady. I hope you find someone you can talk with , like a counselor or a minister. If you don't stop this behavior I see nothing but trouble and heartache for you.