Your problem is normal and very common, Gvb2jana. Psychologists call it performance anxiety, and there is good news! There are many fantastic resources to help you overcome it.
Here are some basic techniques...
1. Set small goals through each stage. For example, "All I need to do is get through the first slide," then "Okay, now get through the next slide." Break the big, scary seminar into small, bite-size chunks you can deal with.
2. Mentally rehearse before the seminar. Several times a day in the days leading up to the class, mentally imagine yourself giving the lecture and doing a fantastic job. See yourself succeeding in spite of various obstacles. This may sound simple, but it is extremely effective!
3. Speak encouragingly to yourself during the lecture. Often our thoughts get away from us in stressful situations and we panic. We stumble over a word and think, "Oh no! I'm blowing this. Everyone will think I'm an idiot. They're probably all laughing at me!" Instead, be an encouraging, uplifting coach for yourself. When you make that verbal mistake think, "It's okay! I can do this. A little mistake like that makes me human, and besides, they probably didn't even notice."
4. Control your stress level. Psychologists call this arousal control. You can prevent the panic before it gets out of hand, by taking simple physical steps. One great method is to carefully control your breathing. Slow breaths in; slow breaths out.
I've written about this in more detail
here, though it is applied specifically to test anxiety. Did you know the U.S. Navy SEALs use the same techniques? The methods work, and I've often used them to combat my own performance anxiety.
this, after coming to home my face look like 
,when i am standing in the stage i feel scared vary much, my body and my new dress fully wet. how to rectify all these things? how can i prepare for next seminor.
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