wow,
i will need a bit of time for this one, sorry but you have asked alot
, i cannot just post a quick reply to this post i will need to take time and read up a little bit aswell,
for starters though i will say join a martial arts club/school, tell me what area you live in so i can locate a good teacher for you to start with, i need to know your height and weight, and bmi if possible, also your age and what sports you play,
i would maybe say from what i have read that yoga and taiji (taichi) would help you alot, but also for a more energetic style aswell i would reccomend muay thai or some grappling, like jujutsu or judo, maybe some MMA,
for what you are seeking it sounds pretty much like what i want out of fitness for myself, not to be too bulky and huge but have a nice decent amount of muscle, to be toned up and flexible, to have peace of mind alot of stamina and all round general health and fitness,
yeah you sound pretty much like me in that aspect, you dont have to give up all junk food 100% and become a super strict vegan either, aslong as you eat a healthy balanced diet with all the rda requirements and endulge a little now and then you will be fine, i would seriously advise you to take up martial arts possibly even 2-3 different types or styles, they are a great way to stay active burn fat stay in shape and also train your mind to be more at peace,
in my opinion martial arts is the ultimate body and mind fitness programe, especialy if you mix it up and learn more than 1 type, also its a culture lesson at the same time wich never hurts,
i will get back to you soon, do you know of any martial arts schools/teachers in your area that have a good rep?.
peace.