It doesn't hurt, your just a pussy. Next time use a needle till it gets all white and crusty, dip it in Bacardi 151 and throw it in your ass like its a dart. You'll be crippled for days, but you'll be ripped.
Seriously though, prop, along with winny, is notorious for being a painful injection. Don't know why, but if your running it for more than 8 weeks you should just go with a longer acting test esther like enanthate or cyp. Less injections and no pain at all. You can cut it with some pharmy grade oil if its that much of a problem. Go to finafarm.com.