I know a lot of people will say, especially if your older, your bones wont change, etc. etc.. thats not true, even martial artists can build up bone structure with time practice and effort. I have achieved a female body being very determined and working hard at it. I can go to the beach in a bikini and even though i am pre-op and only 2 years into HRT, no one looks or thinks i am male, i also started HRT at 31, not 18. Your still growing, so your results maybe better.
Let me show you what i started with:
http://www.hawaiibd.com/U2.jpgNow my body looks more like this:
http://www.hawaiibd.com/A2.jpg and that picture was taken about almost a year ago, HRT and continuing doing what i was doing has improved me even more since then.
Here is what i did: Since i was overweight, exercise 5x a week, 1 hour sessions and diet. Once i got my weight down, i started to focus my exercises on feminine secondary sex characteristics.. abs, obliques, thighs, legs, butt, and hips. Now i do about 150 crunches per workout, and 60-80 obliques, depending on the weight, i also use machines at the gym for inner and outer thighs as well as scissor workouts. Basically focus on the lower half of your body so you can add fat and muscle to those areas. My hips are really starting to come out after i did those exercises.
Also, corset training. yeah it sucks but it works if you do it long term. I got a corset with metal ribbing and wore it for at least 14+ hours a day, now i cut it down to about 12 hours... but i lost about 8 inches off my waist since i started, and now have a 29-30 inch waist from a 38 before.
So yeah there are a lot you can do with soft tissues and running will increase bone on your legs as they take more shocks from the weight of your body. That will push the muscle and fat farther giving you a more feminine shape, but its not instant its gradual and works with HRT, so dont miss your HRT.