Your 7th house which is the prime house of marriage is very afflicted. 6th lord Mars is posited in the 7th house, also making you mangalik. Mercury which is the 8th lord is in the 7th house as well. Sun which is a separative planet is in the 7th house conjoined with Venus. Delay in marriage can be there because of the above planets. It will be very important to do proper matching of the horoscopes before marriage.