Hey bro, something is really off here, unless you are very short, like 5'1. At 140 lbs, you should be able to gain a ton of weight and keep it after. You are very very far from your genetic max. I am 100% certain that your diet is way off. You'll never gain if you don't eat, A LOT! And as you grow, you have to eat more. Start out working on protein. 1.5 to 2g of protein per lb, so you should be eating at least 250g a day, gotten from mostly real food sources, like chicken and eggs and beef. Maybe a few scoops of whey iso. 

From there, start with about 300 carbs and see how you respond. If you can handle more after a month, increase. If 300g is too much and you are getting overly fat, back down a little

Once you have this in order, think about doing another cycle. You should be able to gain 20 lbs on this plan

1-12

Test cyp 350-500mg EW

1-6

Dbol 30mg

PCT starts 2 wks after last shot