is it normal to feel so sad?

i’ve always been a happy person with a great supportive family but recently i’ve just felt sad. i found out my moms cancer is back about a month and a half ago and there have been some other issues with my brother who is 21 and i also lost my virginity last month (i am from a VERY religious family) and i have a boyfriend who is so supportive and loving. but i just don’t have motivation to go on runs or do homework (i have a 4.5) and i’m just kind of going through the motions. is this normal?