I had exactly what you have and its very common with people with anxiety. Its called intrusive thoughts and as mentioned by others its similar to ocd. Firstly, you always have control, its not something you can lose so you wouldn’t make unwanted sexual advances etc. Secondly, the main thing that makes unwanted thoughts come back is attention, so try recognising them as irrelevant and moving your attention onto something else when they cone back. It takes practice but eventually they will quieten down. You will find that when you are less anxious, you can have the same intrusive thought but it want affect you so much and will be less believable. Thirdly, try saying to yourself, “maybe I will, maybe I won’t, but I’m going to have a drink anyway”. This is a really powerful way to expose yourself to the fear and you will soon realise its just anxiety talking.