My 15 month old doesn’t want to walk yet

So my son just turned 15 months. When he’s on the floor he gets up and even when he’s on the bed but he’s afraid to take a step. Instead of taking a step he sits down and prefers to crawl to get to where he wants to go. What can I do ? I sit with him so he can come to me but like I said he’s afraid :(

When did your kids start to walk?