Is it normal to talk to yourself like...?

Like you're talking to someone else. Like I talk to myself in my head like there is someone there with me. I also don't do things that would embarr me like if I were with someone. I ave like an imaginary friend in my head... Whenever I make decisions my friend is there with me helping me, and talking to me about people ect. But I don't hear voices that aren't my own that I control... You know? I've been an only child all my life and home alone alot... So I'm just wondering if I have mental issues or if this is normal.