Mental health struggles😓 (advice?)

So I’ve been reflecting on my mental health and well being for a while now. I know I suffer from anxiety (haven’t been diagnosed, I just know) and I feel like a mild depression at times. I’ve realized that I seem happy on the surface and I try to be, but deep down I am not genuinely happy. My best friend has recently told me that she is starting therapy next week for depression and anxiety and it had me thinking...I’m so proud of her for taking steps to better her mental health and it made me consider the same.

My parents nor my bestie know what’s truly going on with me or the things that are truly triggering this (things that stem all the way from childhood too not just present time) and I feel like it’s time for me to stop sweeping things under the rug, to stop holding hurt in and finally open up in order to save my mental. I’m usually putting others before myself bc that’s just how my heart is and I don’t want to hurt my loved ones by revealing the things I have yet to share with them all this time. I also don’t want my best friend to feel like I’m copying her or making her rough patch about me by finally taking a step for help so soon after her...her doing so just inspired me. I started to reflect on everything I’ve secretly dealt with and how I would tell them...I just broke down crying for like a solid 30 minutes, along with what felt like a little anxiety attack. It’s been weighing on me but I try to make it seem as if I’m always fine and I’m not.

How do I confess my pain and secrets to my loved ones? How do I ask for help? How should I go about this process?