PLEASE DONT DO THIS!
What is 15 years old? Is that Grade 9??? Bro .. there are always going to be bullys around no matter how much you juice. Trust us bro please ... dont do them now. You can seriously fuck yourself up, especially later in life. Do you want to be on HRT (permanant injections of test for the rest of your life because your body cant produce enough normally ... at 20 years old?). I would hate to see that bro. YOu will be a 20 year old, short, bloated, balding, raisin nut kid who cant produce his own testosterone naturally, and wont be able to have sex without your lifetime jabs of testosterone. Think about having to jab yourself with needles from 20 years old to 90 years old or however long you live. Please dont do this.
What you should do:
YOur body IS .... and is going to be ... for the next few years, pumping out shitloads of natty test! If you learn that you can take advantage of this, you will grow ... trust me! What you need to do is start some serious research. You have only been training seriously for a year. Most of us here have beeen training for YEARS!
Get a sound peroidized training program set up for yourself with both short term and long term goals. Get very serious about your training. You can do this .. you will get much much stronger, as long as you keep progressively overloading your weights and changing your routines up. This takes time and effort. Then learn how to eat properly. This will be your hardest part, as at 15 im sure you arent that great of a cook yet. But .. you probably live at home so you can still get some of mom's good cooking. MAke sure she cooks meat at all your meals, and eat like there is no tommorow, but try to keep it as clean as possible. This will be the hardest thing to learn. Add some supplements to your diet like whey protien for sure .. and creatine can help a lot as well.
Get all your shit together and stay dedicated for a few years bro .. you will be very surprised what will happen. Sounds to me like you just want the easy way out ... well there is none, and steroids are a temporary fix to a short term problem for you right now, .. in which the problem out weigh the benefits BIG TIME for you. YOu dont realise this yet, because you dont know. So please ... take our advice, and DONT DO THIS. Learn from our mistakes bro. Many of us here have made some serious mistakes like that, and some even worse, and most of us have suffered the consequences of such mistakes. Learn from our mistakes, and do not do this. If you cant gain naturally of the course of a year or so at your age, then you might as well pack up and forget this sport all together. You will thank us later in life for this advice bro.
Mavy