As far as sports go, are you at Uni? Your gym will do weekly circuit training, go twice a week to that, thats intense exercise for 30 mins at least. Also, spinning classes, Im sure theyll have them, do that twice a week. That leaves 3 nights where you can do your own stuff.
I cant really give tips for exercise, you either are motivated to do it or you arent, if you think 'bloody hell I dont want to go for this run' then you arent alone, the difference is if you think 'i dont want to go for this run, but if I do it I will be 1 step to my goal, and I will feel good after doing it' it makes it just that little bit easier.
30 mins really is nothing in terms of exercise time, it may seem long and boring, but trust me, the more you do it, the easier it becomes, after a while you'll also find that you have to concentrate less on the given task, so you can think about other stuff, other than how boring or how much the thing youre doing hurts.
Break things down into sizeable chunks, listen to music, just think, 3 x 3:20 minute songs is 10 minutes, listen to 9 songs and youve done 30 minutes of exercise.
Its bloody hard to explain but basically you just need to get stuck into it, the reason you havent seen results so far is because you havent been commited enough, and once you do start seeing results itll further motivate you to carry on.