I was in your shoes when I was younger. Tall & thin. Unfortunately I have to tell you what you don't want to hear. No steroid or supplement will give you any results without eating eating eating!! The sooner you accept this the sooner you'll get the size you want. I know it's hard but you literally need to force it down. Start off with weight gainer shakes. Use 2 scoops & whole milk, you can easily have shakes that are 1000+ calories each. Have one when you wake up, after lunch, at 5 pm, & before bed. That alone will give you 10lbs+ in a month. Diet is key. Look up a sample bulk diet & follow it to the T. You're nowhere close to being ready for gear if you can't already eat big & have a good routine down. Do that & let me know how many lbs you've added in a month, then 2. I garantee if you do this daily in 6 months you'll put on 15-20 lbs if not more! Good luck