I AM ITCHY

My vagina has been itchy on & off for about 4 months. I can’t take it anymore and I don’t know what to do. I don’t know what to do but all I know is i can’t go much longer feeling like this. It’s usually starts itching loads after i use femfresh, so I stopped using it. However, this morning I woke up and it was itchyyyy. And it was even burning. And im getting white discharge/ gooey stuff.. help?

Also, I’ve never been to a sexual health clinic before. Im not really sure how to book an appointment. I’ve never really experienced something like this before cos im 16. Can I get help with that too please