Crying over something stupid

So, I'm not one to really care about my weight bc I've always been use go being like "yeah I never gain weight" bc I use go always weigh either 140-143 & It like, never went passed that & I I did gain like 2lbs It would go away, but I weighed myself earlier today & I'm 148.8, basically 149lbs & Idk why but It really bothered me & I actually cried, now I'm not saying I'm fat, like I know I'm not fat, It's just my weight I don't like where It's at & I would like to have a slimmer stomach. But Idk where to start. Any tips??