I’m 16 and want to move out but my mum won’t let meWatch
Do you realize how difficult the real world is? Take all of the financial and emotional support you can get from your mum, as you'll get a shock once you move out.
Unless you already have a decent, reliable income, it is incredibly tough to set yourself up in your own place. It's not impossible, but it's certainly tougher than it was a decade ago. That's why lots of graduates are moving back in with their parents for a couple of years after getting their degree. It gives them a chance to build up some savings, so they have that security when going it alone.
If you still want to leave home, your best bet is to show your mum you have a plan for how you are going to cope, especially financially. She'll see that it is a mature & responsible approach you are taking, not just a rash decision because you want to live with your partner. Good luck!
However the downside, you're going to have to work hard to pay the rent with your boyfriend, and at your age there is no guarantee a year or so down the line you'll be still together.
Focus on career and job yet before thinking about such a move.... I still think you're still too young.