yes it is normal there are things that are really none of their business when and if the time is right to share these things and the right person is there you will know until then make sure it is something you can deal with if you don't sharing, and don't be afraid to get help if you need help there are professionals out there who you can trust.
We are weak but God says through him all things are possible. God says Love God and Love people. God said that whenever 2 or more gather I will be there. All of life is built on togetherness we need to let eachother know everything that's bothering us but we also need to use the help we get to better ourselves and learn.