Whether a marriage is blissful or not depends on how you manage your relationship, not whether you missed the auspicious timing. If everyone's marriage is based on auspicious timings, there won't be so many divorces liaoz.
It could be due to hidden issues that were not worked out beforehand or expectations that were not managed properly. Whatever the case, don't blame yourself for things you have no control over. Just focus on improving your relationship or work out the issues.