帮我改一下错的地方 ,.,格式什么的不用改

Dear Chairman,
I am a student from Class 1,Grade3.I'd like to be a member of the Helping Hands Club.
I like to help people.I often give my seat to someone who really need to sit in the bus.(I always offer my seat to those in need) And I often join the social volunteer activities,such as cleaning the public parks,washing the public chairs.In our life,many people around me(us) need others' help and I'd like to try my best to help them.If I (am allowed to)join your club,I think I can learn(know) more people who need help,so I can help more people.
Can you give me this chance?(I hope you can give me the chance to join your club/can I have the honor to join your club?)
Yours,