Where/how to get diagnosed and how to escape the fear of going

I've been trying to work on myself and my mental issues for a while now, but the reality is I can't escape this and it's beginning to severely affect not just my own mental health but my relationships with others.

I haven't officially been diagnosed with OCD yet, but doing research and looking back on my experiences as well as reading about other people's experiences exactly like mine, im almost 100% certain this is what is wrong with me.

I want to go in and get officially diagnosed so I can move forward with trying to figure out how to help myself, im just curious where I should go first, as well as tips to maybe overcome the fear of going through with it

Thank you