Can I be 115 pounds and still have muscle?

You shouldn't aim for 115 pounds, that's underweight for a fairly muscular male who is 5'8. Aim for 150 pounds. Run one day, do a muscle workout the next day, run farther the day after that, do a harder muscle workout the day after that, and so on. Keep challenging yourself, good luck!

Edit: 150 pounds at the lowest. Also, if you are going to diet, eat healthy food and don't even think about starving yourself.

You can be skinny and still have muscle and be over 200 pounds... I'm not exactly skinny but I weight 200 right now but I do have quite a bit of muscle mass. Weight in pounds isn't everything because of multiple variables, such as water weight, fat percentage, bone density, and so on. Case and point, get yourself to where you want to be with muscle mass and fat percentage while being healthy. Good luck Amigo.

At 115 lbs at 5'9 you would look anorexic! Why in the world would you want to be so skinny? You definitely wouldn't look like you lift, you'd just look like you need to eat something.

i dont think thats realy healthy i would aim for posibly 160 i would go to a dietrishon or nutrishionist

180 might be god enough, since muscles weigh more then fat.