I know it is easier said than done but think of a lost game as an opportunity to learn from your mistake.
and you are only 14 as you say you can still become great.
just because you practice doesn't mean you become good instantly - have patience. keep calm and in time you will see that you will improve.
I know your feeling and anger but it doesn't lead to anything. your anger is a frustation because you feel all that training should lead to easy wins but it takes time for all that learning to be really understood.
I think we have all been there.
My name is Varun and i am 14 years old. Whenever i play i am very afraid of losing. My mind is not concentrating and i cant play well. Always scared of loss. The fear makes me make bad moves and sometimes blunders. I have been studying chess a lot these days as i had my summer vacations recently. I think all my chess practise and spending time on it is just going waste. Someone please help me by suggesting some tips to get rid of this. To mention, I sometimes get very Angry after loss and feel very bad and cant play my best during next round.
Thx