Anita ji namaskar I have chance to analyses your kundli.no doubt there is mars in eighth house from lagna with RAHU.In eight house mangel dosha is considered strong mangel doshs.But you note you are manglik from lagna of pieces ascendent.but you are not manglik from moon chart. as from moon mangel mars is in fifth house. no doubt mangel in 8th house give struggle ful life.gives many ups and downs in life. some intelligent astrologers not considered its mangel dosha.in pisces ascendent.it may delayed your marriage but definitely you will get married.some astrologers does not consider it mangel dosha when venus is in 12 th house from rahu. so nothing to worry.you are humble advised to do the kundli matching from expert astrologer so that problem or doubt of this dosha may be removed. your positive point is that Jupiter brahaspati is in 9th house of luck and has fifth aspect o his own house lagna.which will reduce your problems. thanks best of luck.