Miklon06:
Hi, I am 120 lbs and I want to be bigger.
I have question to you. When you realized you are chubby. What weight should I gain to check is it sth for me?
Only you can decide if it's for you.
Since you are a rather small guy, I'd advice you to gain slowly. That way, it's not a shock as you get bigger. It will also be either to stop if you decided it's not for you.