Is your want to express your feelings in public enough to justify possibly damaging the relationship you have with your family and peers?
I know you don't WANT to hide it, but there is a fairly good reason to hide it, whether you like it or not. When you're older and have a job and home and life, essentially independent of your family (as independent of your family as one gets anyhow), then maybe that would be the most prudent time to let them know about this.
But it's a matter of priority. If you feel it's a priority to be open about your relationship, and you're willing to accept and deal with the consequences, then by all means, go ahead and let people know; but otherwise, it might be a bad decision to do that just yet.