Does anyone get this thing like a voice in your head telling you what to do?

I'm sorry to see that no one has responded to you yet. I saw posts like your and decided to throw my hat into the ring, though I may not have all the answers.

I am not a doctor or therapist, so please get other, more professional opinions to complement my thoughts on the subject. As you put it, what you're describing is not typically what I would consider normal, though I will say as well that normalcy is overrated and people don't often admit to unusual experiences when asked (hearing voices is probably far more common than anyone realizes). Auditory hallucinations which seem to take on a decision-making role in one's thoughts, at least used to be considered characteristic of schizophrenia. That's the bad news. There is ample good news, however. Voices are a "positive symptom," something which an afflicted person experiences but which an unaffected person does not. Conversely, negative symptoms are those which reflect the absence of mental activities present in the unaffected. Apathy is a negative symptom since it is the absence of drive or motivation.

1: Positive symptoms are the easiest to treat and the least likely to be permanent. John Nash from It's a Beautiful Mind represents a positive-symptom heavy form of mental illness. He lived a productive life, generally a happy one, and inspired millions while contributing to mathematics.

2: While it might be "abnormal" to hear voices, it is not abnormal to experience things others do not, and you will always be able to relate to others this way, even if the particulars of your situation seem strange. Everyone knows what it's like to feel different and to be insecure or to fear that they will not be accepted. For this reason, even symptoms as alarming as hearing voices don't need to alienate you from the human experience. I'm not sure if this is a current concern of yours, but I thought it was worth addressing here.

3: You're brave. The average person doesn't put this kind of question to a group of strangers, but you did, and that shows a willingness to face whatever challenges life presents you. I believe that that is infinitely more important in determining your future life and happiness than nearly anything else.

4: If worse comes to worse, and you are experiencing some schizophrenia-related symptoms, you appear to be able to trust in the good intentions of others (by making your post in the first place). Trust is very difficult for people suffering from similar conditions, and this makes it hard for them to reach out to others, hold a job, or form friendships. Fortunately, you seem to possess this very beneficial trait.

I think most people will advise seeing to a psychiatrist or counselor. Personally, I take everything people say, professional or otherwise with a grain of salt, but you do need to make sure you're safe and that you have a plan in place and a professional you can reach out to if things become more challenging. That said, I'd focus on trying to live a healthy, fulfilling life and less on whether or not you have this or that condition. If you use recreational drugs, I'd strongly recommend gradually tapering off of them with some professional guidance. 

Like I said above, these are just my two cents, and I'm not a professional in the field, but I've had experiences with severe depression and severe alcoholism as well as a lifelong curiosity about the mind. In any event, I'm glad to chat more, if you'd like. 

Jack