What you describe sounds like Traumatic Masturbatory Syndrome. However, whether that is real is not quite known. You can find websites about it and you might want to look it up. Medical research might not clearly state it exists, but you might find surveys that suggest there could be a correlation.

Research it.

As for masturbating normally, there is no real normal, it's just whatever you do. If you feel your method is a problem and want to masturbate face up, then keep trying and don't give up from frustration. Just sit or lie down and do what feels good. Dry hand, lubricated hand, or even a toy. Use porn or imagination. As feelings build keep going. Straightening the legs out or flexing your pelvic muscles (look up PC or BC muscles) might help you achieve orgasm better.

does continuous masterbating affects the health
will it affect sexual life in future

The only way it is a bad thing is if it is interfering with other parts of your life. You say it's interfering with your studies, which isn't good. If it interferes with dating, socialization, hygiene, or anything else that should be important, that's not good either.

It won't affect your health unless you are injuring yourself somehow. It won't affect your sexual life in the future unless it is getting in the way of you going out and meeting girls. Otherwise, masturbation is normal and healthy, not something you should be ashamed of.

If you do feel like it is starting to interfere with your life, try to focus on the things that you should be doing instead before you let yourself masturbate. Study out of your room where there are other people. Find other things to occupy yourself in your free time, as well. Go out with your friends.

If you find that you cannot control it, that it is too compulsive, then it may be beneficial to talk to a doctor or counselor about it. I know it's embarrassing, but your problem isn't uncommon. It may be due to stress or something like that.

i suggest u that ..... tried to make ur mind and tried to prove urself that i am not going to do that ...... u started masterbation now its not easy to forget this thing ok.......... it was so badly wound ur body u got pain ur joints an mind weak . ashemed to stand in front of girl and loose confidence or self insecit.........