Fasting for 3 months - goal weight?

I've been going for 3 months now and I'm 22 pounds down! Yay for that. Something I'm unsure of as I keep going is what my goal weight should be? I have body dysmorphia a bit to where I think I will have a hard time knowing when to stop. How do you all pick your goal weight?? I know the numbers aren't everything and I plan to start building muscle when I hit the weight I want. Just not sure what to go for. Supposedly I'm supposed to weight 120 lbs for my height but I've always been muscular and that sounds tinnnyyyyyy.