That day, Feb 12th, was my father's birthday. I went to buy a present for him. I wanted to say "thank you" to my father in the way.[1] I went home on[2] subway train. It was crowed there, but luckily I found a seat and sat down. I thought my father would felt overjoy[3] when he recived[receive] it .Just then I saw that an old lady got on the train. And she stood without a seat. I thought I would be ashamed if I did nothing. So I stood up and gave the lady my seat[4]. She thanked me again and again.
I feel happy, I meant it, when I do something to help others[5]. It is rewarding to give your kindniss[kindness] away. And it will make the world warmer.

修改意见：
[1] in the way 的意思是“挡路了，是妨碍”，此处要表达的应该是用这种方式：in this way
[2] 乘地铁回家：I went home by subway.
[3] Overjor是动词，使狂喜的意思，此处应用形容词，overjoyed
[4] so单独引导结果状语从句，没有主句。Nothing后面改成逗号。I thought I would be ashamed if did nothing, so I stood up and let her take me seat.
[5] 这个插入语用的不正确，建议不要用I mean it, I mean it 是前面自己说了一句话，说完了，句号结束了。后面加这个话表示：我是认真的！这里，如果真要插入就用：I think, I believe