I would hesitate to label this as "healthy" or "unhealthy" on its face. I think you need to examine why you feel the need to keep it a secret. Is it because you're ashamed of it? Is it because you're afraid people wouldn't accept you or would look down upon you? Is it because you don't find it a particularly important thing to share? Only once you've examined your reasons and determined what purpose your secrecy is serving can you decide whether it's good, bad, or neutral.