Well, you're 18 so nothing would be disclosed to your parents or anyone else unless you gave your doctor permission to do so.
If you have the money then buying dressings etc would be the most anonymous way to go about things but don't go to your local chemist or they will start recognising you and put two and two together. Go into your local town/city and vary your chemists.
If you don't SH much then buying first aid items shouldn't dent your pocket too much but if you don't have much money I would personally grit your teeth, tell your doctor you self harm and that's why you would like them on prescription. Add in that you are struggling to pay for the dressings etc yourself being only 18. You can say that you're not ready to go into it but that you want to be responsible and dress your wounds properly.
Good luck xx
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