Ok... then you will eventually show the counselor how wrong they are for being so immature and making fun of you.. .perhaps they have other skills that you can take advantage of in the meantime? "Using" a counselor to help you heal is quite alright! Talk about your issues anyway... and cope the best way you can in the meantime.
Self harm is not the problem, btw... it's a coping mechanism (not the best one though.) You are trying to cope with issues that are difficult. The counselor can help you with that. Keep the self harm to yourself in the meantime...and share with us here. There are plenty here who understand you.