What do you guys think? is she just being paranoid?

ok so in 6th and 7th grade i was a bit of a chubster haha and now in 8th grade im pretty thin. i do have a bit of belly fat tho haha. but my mom thinks im losing weight too fast. she thinks im too skinny even though i have that fat on my belly. the reason behind this though is because through 6th, 7th and 8th grade my drug use has escalated. like 6th grade i was a social pot smoker, 7th grade i was a stoner and a social drinker and now in 8th grade im one of the 3 biggest stoners at my school (keep in mind about a 3rd or more of the kids there smoke pot), i pop pills and go on drunk binges quite frequently. so i think shes concerned about my drug use and thinks thats why im too skinny. but im not! thats the thing. it would be different if i was like anorexic skinny but im not. i have chub haha. im 5'7 and 130 lbs. not too skinny in my opinion. so what do you guys think?? do you think shes just being too paranoid about this or is she right?