Be proud of yourself because you are doing the right thing.

This is a story about my trip <s>in</s> to Germany.

("trip in Germany" sounds a little odd. "trip to Germany" sounds more natural, but you could also say something like "my time in Germany")

Last year I stayed in Germany for two weeks. I stayed in a village <s>which</s> called Querfurt. I had such fun in this village - <s>such like </s> for instance, I looked after two dogs, fed them <s>foods</s>, and walked with them.

<s>In this farm also have another volunteers</s> There were also other volunteers in this farm. I remember that <s>their</s> there <s>is</s> was an old man who <s>has</s> had been working as a builder. He told me about his life story and <s>shared</s> showed me <s>his</s> a picture of his young grandchild.

("shared me a picture" sounds very strange, I changed it to "showed me a picture" which sounds correct, but if you wanted to stick with using "share" you could also say "and shared a picture of his young grandchild with me")

One <s>days</s> day he <s>looks</s> looked at me and <s>say</s> said, "You have to know how brave you are, you are so young and you will have an unbelievable future, however don't give up easily."

("however" does sound a little bit odd in that last part... I feel like I'd more naturally say something like "just don't give up easily", but however is still not grammatically incorrect I suppose)