I think there are two aspects to it. Essentially the question is, are you still truly interested or not. If you are not then definitely you must sit and analyze whats wrong with your choice. According to me, you are not interested in that. Then you should look for what thrills and excites you the most and decide accordingly. Personally I would suggest you to pursue what excites you the most.
Another aspect, if you know this is what I have to do, then you need to stop and brush up your skills. There is no point in giving u the. Just ask yourself a question that have I come this far to quit now?? This is my personal experience that this question is a gem. It’ll get you answers to a lot of questions as well. Therefore, you must no give up. Best of luck!!!!