I'm worried that i'm infertile?

There are a lot of people who can be infertile, and they don't need to do drugs or have a trauma, there are just things, that happens. If you really want to know, visit a doctor, and do an examination about it, they will tell you if you are infertile or you are good and ready to go. Or just wait until you want some kids and you will see if it goes well or not, then seek help. I know some people who wanted children and they couldn't get in lot of attempts, they went to doctor, and found out the problem. Even I don't know if I'm fertile, I will find out someday, I guess.

yes drug use can cause fertility problems See a doctor get a sperm count.

Only way to tell if you are infertile is to have a semen analysis. See a doctor and ask for a semen analysis if concerned/

Drugs has nothing to do with it.

Take some of that drug money and spend it on a visit to the doctor and ask him to check your fertility.

The volume (amount) one ejaculates is in no way a indicator of ones fertility.

Fertility is based upon the motility and viability of his sperm cells.