Telling somebody you trust wouldn't really have any negative effect. People can always help you because they have different perspectives, and they want to help you. And even if you don't directly ask for support, by telling them what you're dealing with they'll notice things about you if it starts getting worse for you. You can also talk to people just about the things that make you depressed and not even tell them you're depressed. So there are simply a lot of ways that it can help you. Of course, if you see yourself getting over it by yourself soon then you may not see any benefit of telling people. It might happen, but if you don't trust that it will then you probably would be safer talking to one or more people you trust. I don't know what you have to lose by doing that.