The above post is great,I just want to add (I know this sounds harsh but it comes from experience), if you find you're not losing the weight, the answer is simple, you are not working hard enough. whether it be on the diet end or the exercise end. It takes a lot of work to change your body, but its work that any body is capable of. And besides you'll feel so much better when you've achieved your goal because you know how much hard work you put in.basically; do not ever make excuses for yourself, think about decisions you make as if you're watching someone else make them and judge accordingly, this will help keep you on track.And about being embarrassed or whatever in the gym/doing practicals; everyone has to start somewhere so you shouldnt feel ashamed, and this is uni not highschool so your peers should be respectful (especially if you fully participate and try your hardest)hope this helps