You say you "do not have any courage to finish my thesis". It sounds like you are either worried if you'll finish your report in time or if it will be good enough to pass (or perhaps both?). Don't worry about this too much. Many students have this problem, especially at this stage of a final project. If your work hasn't been good enough your supervisor would have mentioned something about this by now. Just save your energy and focus on doing what needs to be done. Agree with yourself that you'll worry about this AFTER you've finished your report and presentation.
First of all, make sure you get enough rest. If you don't get enough sleep, your concentration will go down and as a result your motivation may go down as well. So (try to) sleep at least 7 hours every night, preferably 8 hours. Also don't do any work at least 1 hour before bedtime (preferably 2 hours) because your body and mind needs time to relax and wind down.
Second, when you start working turn off (or don't turn on) everything that isn't relevant for your work and may distract you. Turn off your cell phone, email, tv, radio. Close the door. Tell other people to don't disturb you. Don't check this or any other website unless it's required for your work. Some people try to do several things simultaneously. Don't! It will cost more energy and slows you down.
Third, make a list of everything you still need to do to finish your report and presentation. In the morning start with the activity you dread most or is the most urgent. "Reward" yourself (if possible), by doing the activities you like better later that day.
Fourth, make sure you take breaks regulary, a 5-10 minute break after every 50 minutes of work, and a longer break of 30-45 minutes after every 4 hours of work. Working for hours on end without breaks is NOT effective. It will wear you down more quickly and will reduce the quality of your work. Use a timer or clock if necessary to keep track of time (you can also use the pomodoro technique here) and be strict about it.
Fifth, reward yourself for every substantial activity you finish, especially the most dreadful or urgent activities. Rewards can be drinking a cup of tea, allowing yourself to check your email (briefly), watch some tv. But only do this during scheduled breaks and not longer than that (danger of procrastination!). If it motivates you, think of a big reward you'll give yourself after everything is finished.
Finally, it's probably hard to do right now, but try to see the fun in doing these last bits of your study and try to enjoy doing them. You've almost got a Masters degree! Just hang in there for the last few days.