People know me, but can't understand me
I don't have any friend with whom I can talk and I can share everything. People always think that I like to live alone, but they don't know, how much I pray to God to please give me one good friend with whom I can share anything without (any) hesitation. People always consider me as a quiet and shy girl, but they don't know, how I feel inside? I think they are correct; I am very quiet, shy and reserved person, I think we should not share our feelings with everyone. Only a few people in this world can understand your feelings, the rest of the people just make fun of you,r feeling (and laugh at you), that's why I like to keep quiet.
There's an saying [expression] in English : 'Still waters run deep'.
You are an intelligent and imaginative girl, so I will leave it to you to work out what this means.