Belial…You’re not alone in doing something that doesn’t turn out as well as you would like it to have...that happens to EVERYone at times. And I don’t think you failed, you did accomplish some parts of the project…it’s further along than it was before you started…you either just didn’t have enough time to do it or needed some more experience or training to complete it in the timeframe desired by your supervisors. View it as a learning experience…if you want or need to develop your skills more in that area, you will.
Additionally, this also points out something else EVERYone needs…the ability to prioritize. When given more to do than the time available to do it, prioritize…get the most important things done and if you determine there are things that you can’t complete in the time they need to be done, let those expecting it to be done know so other arrangements can be made. For example, since it appears that you have a short deadline for selecting a thesis topic, that would appear to be a high priority right now…and that might mean that there a few other things you are doing that may slip lower on your set of priorities.
Don’t let this one setback keep you from moving on with your life…refresh your mind, think positively about yourself and move forward.