Do you trust your family?
Then do not talk to strangers, as to respect your family, and discuss with them about you wanting to be able to talk with strangers online if that is what you want in some way that will make all of you happy, perhaps a supervised way.
If you feel bad about it then you feel the burden of disrespecting them... or also perhaps if you don't trust your family don't discuss anything and do things your way.
I don't know how mature you are, and how much independent of your family you are... but if you're 15, probably it is a good idea to be in good terms and have a good relationship of trust with your family. (if possible)