That you are not losing weight may signal that you are gaining muscle, which would mean good things rather than bad things. I am not saying to you that you cannot lose weight; I am saying that if you are like 95% of people who try, permanent (not short term, but permanent) weight loss will elude you due to the normal workings of your body and not due to anything subpar on your end, be it not enough effort, eating more than you think you should, etc. Faced with the fact of failing at their weight loss goals, people feel defeated and often give up exercise, which is a bad idea. If you set measurable, achievable goals that relate to your fitness (say, the number of HITs you do on the bike), you won't set yourself up for feeling defeated, but the opposite will happen - success breeds success, and your success at exercise will improve your conference level enough for you to try other things and be successful at them. You will get into an upward spiral rather than a downward spiral.