If you never open yourself to ideas outside your own then you will never know how well you hold your own beliefs. If you live your life in a bubble, never experiencing different cultures or even opinions than your own, you cannot truly understand yourself or support your reasons for believing what you believe. It takes seeing what is out there, hearing other viewpoints, and balancing your beliefs against them to firm your stance. For example, traveling to places you have never been, learning, not only about your own beliefs and stances on topics, but also the views that differ from yours, and talking to other people; debating concepts and ideas.
Travel is one of the best ways to expand your horizons. When you visit other cultures and other countries the differences can stand out glaringly at first. Sometimes these differences show in uncomfortable ways, but sometimes in ways that you may actually prefer. Rather than immediately blocking yourself off from the possibilities, take the time and patience to allow yourself a chance to consider which you prefer, your way, or the way of the place and people you are visiting. You will come to realize that different does not necessarily mean worse and it also does not necessarily mean better. Sometimes different is just different and that is okay. Then you will notice the similarities beneath the differences and realize just how much in common we all have. You might even discover that the differences are not really as different as you thought they were at first.
The more you learn about other beliefs, as well as your own, the stronger yours will be in the end. You might learn things that challenge your views and if you work through them you will learn a lot about yourself. You might experience change on this journey, but if your beliefs can’t hold up to being examined then they are not strong enough to hold. It is not a shameful thing to find yourself wrong as long as you can face that fact and adapt to the new information.
Discussing what you believe with other people and having an honest back and forth or even a heated debate can help you grow. You will learn how to verbally share your beliefs and how to respond in a calm and fair way to differing views. The goal is not to block out the other views, but to give them proper attention and weigh them fairly. If someone shares with you information that contradicts what you believe and that information, under scrutiny, stands up then you do nothing but harm to yourself by not accepting that and trying to integrate it into your world view.
Honor your beliefs and travel, educate yourself and discuss them. Become stronger by looking at differing views with calmness and equanimity. Accept that sometimes even the most deeply held beliefs can be wrong and that it is a brave and courageous person that accepts that and adapts. The worst that will happen is that you grow and your beliefs will be stronger for it.