Hello,
Sanyasa yoga is not a useless yoga.
In your case,you want to marry.
But you are not getting married due to
negativity in marriage house(Seventh house).
Real sanyasi is one who voluntarily
decides not to marry and and also not to
enjoy other usual luxuries.
They prefer Brahmacharya(celibacy or
avoiding sex)due to their strong desire
to remove sins of soul.
The situation is different in your case.
You have to do penance for one year to reduce
evil on marriage.
You type in google-kumrao99 penance method.
Read and put them in practice.
Any clarifications on penance can be obtained
freely from me.
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