Last night after I became lucid, (I was in my own house in my dream) I was just about to open the sliding door to go outside to fly off and focus on a particular goal I had set for myself, when someone grabbed me from behind and held me there. Of course I was utterly shocked, this was my dream, and I had not expected anything like that to ever happen. I quickly hollered, “thought-person leave!” that has worked before in other LDs with people I saw. So I did, but nothing happened, he/she still had a hold of me, I stepped down hard with my heel, and finally managed to get free, ran outside, and flew away. I was happy to be flying again and immediately calmed down and remembered my goal.
I used the search in this forum but was not able to narrow anything down regarding a scenario like mine. Has anyone ever had this happen? Only afterwards did I realize that I should have turned around and asked the person who he/she was and what it wanted. I just got caught of guard and ran! 
You should have remembered his face and reported him to the dream police.
But seriously, maybe you are unsure of yourself, a lack of confidence that is revealing itself in a funny way. That’s the first thought I got.
Hello KauaiDreamer,
Yes, this has happened to me before: someone who seems to be beyond my thought forms who tries to control me with a negative force. This is called a Negative Entity.
There are negative entities that live in the astral that don’t like it when physically living people start to wake up spiritually (lucid dreaming is a start when awakening spiritually) and so when that spiritually evolving person goes to the astral(via LD’ing or astral projection) they can sometimes be noticed by the negative entities and be attacked in ways that can’t hurt them, but can hinder there LD’ing / astral explorations.
There are ways to expel them away from you…
But don’t worry, there job is to scare you away and try to get you to stop LD’ing. Sometimes they can be strong and evoke fear in you that you thought you never had.
Well, congratulations, it is actually a blessing to be on a “wanted” list of the dark side. It means that your inner light is starting to shine strong!
Well, let me first say that I don’t buy into the whole “Negative entities” idea.
In my readings abroad I have come across that topic before.
And from what I’ve read, they can’t do anything to you. They are powerless and doomed to travel the astral world for eternity, there is nothing to worry about if you should cross paths with another one.
But next time one tries to f#*% with you, destroy it, show no mercy!
Again, I seriously think it’s just your subconscious doubt that’s holding you back.
Thanks Hero and Six. Now I know that this can happen I will be prepared. If it is something in me that is holding me back, then I will find out what it is and overcome it, and if it is an entity I will find out how to be at peace with it. I try not to be aggressive, and a peaceful solution is better then destroying someone, be it spirit or otherwise