Listen, don’t tell anyone you’re not sure of how are they going to react or until you get to have some sort of back up plan. Specially If you don’t feel comfortable telling them.
It is good tho, that you count with the support of this one person, one step at the time is good. You go ahead and take your time with this, think about the best approach to your mother (since you’ve known her through all these years), whatever happens next, will have a great future specially cause you’re.the one building it.
It will go fine with whatever you choose. :*