Happy day

Today I feel happy because I my family came to visit me. I'm living alone butand sometimes I feel sad., I miss my parents and friends.

[The "I" was probably just a typographical error. I make them, too, sometimes, even when correcting someone's text! You should use "and" instead of "but" because being sad is a result of living alone, not in spite of living alone. If you were happy, you could write "I'm living alone, but I'm still happy.]