Nervous to quit job

Hi, I have a bit of a situation! I'm 26 and have been at my current company for almost 6 months. Unfortunately I feel as though the job isn't a good fit, both personally and professionally (management have been quite toxic towards me also!) and I want to leave and find a job in education, which is where my passion lies.

The issue is, over the past two years I've done a lot of leaving. Firstly I left a job I enjoyed (I'd been there two years, it was in education) to a pursue a fixed term position in Spain, which I also loved. When I returned to the UK last year I started working in a primary school, but didn't enjoy it as much as I thought. That was went my current job was offered to me, and I quit the school to pursue it as I really believed that it was my dream (travel industry, opportunities to use languages, etc.) Now I feel as though I made a massive mistake!

I'm really nervous and scared to quit as I've been through the leaving process so many times and I feel really embarrassed about it. I really want to quit as it's draining me and affecting my mental health, but I don't know how to pluck up the courage to?!