Yeah, there's lots of people who feel the same way man! In fact, I have a varicrose vein above my left nut too
Don't worry so much about those - they're very common (about 15% of teen guys and adult men get this - that's a lot)
At 17, you should be more developed tham you say you are. Do you have armpit hair? Do you have pubic hair? How big is your penis? You might not be as far behind as you think!
If you feel like you're not developing at all, or VERY slowly, see a doctor. He can let you know what's going on and what you can do, and there might be a few medicines/injections he can prescribe to get your growth hormones going.
Note to others: These medicines and injections are ONLY for people who are beyond late bloomers. If you're a late bloomer and are considering these, it's unlikely that a doctor will give them to you so don't ask about these on the forums unless you are 17+ and have not developed at all or very little.
Again, please answer the following questions, just to make sure that you're as far behind as you say - you might not be as far behind as you think: Do you have armpit hair? Do you have pubic hair? How long is your penis when erect? How tall are you?