How do I open up?

*relevant background information*

I have depression as well as multiple forms of anxiety (all chronic)

This is something that I have always had to deal with alone. no one has ever stayed around after I open up because it's so overwhelming. Because of this it's VERY difficult for me to open up.

My boyfriend and I met a few months ago.

It started out purely sexual but eventually we both decided we wanted more and didn't want to be with other people.

Now that we've been together for a while we're starting to have problems because we haven't been able to really open up to each other. he's expressed desire to really get to know each other. he wants me to be able to come to him no matter what problems I'm having. he wants a future with me and I want the same with him.

I need any advice or tips on how to open up and build a healthy relationship.

we no longer want sex to be the biggest part of our relationship. we're both willing to put in work I just need help figuring out where to start.

any help will be greatly appreciated!!