X-intercept just means where it crosses the x-axis, and y-intercept is where it crosses the y-axis. So, x-intercept -3 would be on the x-axis on point -3 and y-intercept 5 would be going up on the y-axis and at point 5.
Just try your best out there. Have a talk with your mom and tell her that your not like everyone else and that you go at your own pace. If she can’t understand that you are trying your best then she’s not being very supportive