Is it good to be alone?

Someone asked me, because I am alone.

I think it's good.

In contrast, my brother says, " you are only 19, that's why you think like that, it really is hard to spend your whole life in loneliness."

He also said, "you need someone to share your problems with, you feel irritated when you find no one with you." I can't argue with him, not because he is 9 years older than me, I can't because I don't know what to say.

I don't want to spend my 28 years in loneliness. I can understand his pain, though.

I have the habit to be alone, but sometime I feel sad and I cry.

Then the future will be beautiful.

This question makes me confused.

Alternative: This question confuses me.

Someone asked me (this), because I am alone.

On the other hand, my brother says, "you are only 19, that's why you think like that, it really is really hard to spend your whole/entire life alone/lonely."

"on the other hand" = "au contraire" in French :)

He also said, "you need someone to share your problems with, you feel irritated when you find no one with you." I can't argue with him, not because he is 9 years older than I am, I can't because, I don't know what to say.

You shouldn't write a comma after "because" :)

I haven't spent my 28 years in loneliness, but I can understand his pain, though.

I have the habit of being alone, but sometimes I feel sad and I cry.

Then your future will be beautiful.

I don't know who is correct/right.

In my opinion "who is right" sounds more natural than "who is correct."

This question (makes me confused)(confuses me).

Someone asked me, because I am a loner alone.

"Alone" is a state of being, usually temporary. A person who is persistently alone is called a "loner." I am a loner. I like it.

I think, it's good.

I tend to agree with you. HOWEVER, you really need a comparison. It will be painful, perhaps, to engage in activities with other people, but it will tell you if being alone is what you want, or merely what you have at the moment.

If you are busy in your life then you won't care about anything else.

opposite it, But my brother says, "you are only 19, that's why you think like that; it really is hard to spend your whole life in loneliness."

He also told me said, "you need someone to share your problems; you feel irritating anxious when you find no one with you." I can't argue with him, not because he is 9 years older than me, but I can't because, I don't know what to say.

I don't spend haven't spent my 28 years in loneliness, but I can understand his pain, though.

I have habit to be am habitually alone, but sometimes I feel sad, and I cry.

You should think about what you have in your about the present.

Then future will could be beautiful.

I would avoid absolute statements using "will" or "is." But limiting one's attention to the present won't guarantee a beautiful future. You do have to make certain plans.