My boyfriend’s mother only wants his name on the lease

So me and my boyfriend(we’re both 17 and will turn 18 in June) of 2 years are moving in together this June I know it’s a while away but everyone says that it’ll be no time. She only wants his name on the lease meaning I won’t get credit for it. And I get why as a fail safe and at the end of the day she cares about her son. How do I protect myself and get my credit build up. Please explain in simple terms I’m not the brightest.