You were born on a Dwadasi. Rasis Tula and Makara are Dagdha (burnt) rasis. Their lords Venus and Saturn are also Dagdha. No cancellation exists for the Dagdha effect.
Your 7th lord Jupiter is afflicted by Venus and the 7th Cuspal lord Saturn is also in the rasi of Venus. Jupiter’s nakshatra lord is also Venus. Jupiter is also aspected by Saturn. Jupiter is a badhaka for the chart too. Although a good Hamsa yoga is formed by Jupiter being in his own house and in a Kendra from both Moon and Lagna, good results may not occur due to presence of Venus in conjunction.
In Navamsa, Lagna is occupied by Mars and aspected by Lagna lord Jupiter from the 7th house. The 7th lord Mercury is in the 12th with Rahu and aspected by Saturn, Venus and Sun.
Put together, the marriage which should have taken place in the current dasa of Jupiter has not occurred till now.
A third factor causing the delay is the Grahana yoga formed by Sun and Ketu which also leads to pitru dosha.
Perorming a remedy for pitru dosha (you can contact the local pundits for this) and wearing a diamond ring (on the tight hand ring finger) or pendant set in gold (back open to allow rays to pass through to the skin) to improve the power of Venus, can help you get married. Jupiter’s dasa is till Nov 2026. The next dasa is of Saturn who is also in Jupiter’s nakshatra. Prayers to Lord Shiva can also be offered regularly on Mondays which will also help to strengthen Saturn too.