Does it get easier to open up to someone?

I’m in my first relationship and I’m already not an open person and is afraid to be vulnerable in front of people. I know that opening up makes the relationship deeper and i’m worried that when it comes to it i won’t be able to open up like he might want me to. Any idea on how to make this easier? Not even in a relationship even with friends.
Does it get easier to open up to someone?
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