Marriage should not be based on istikharah. There are many more important steps you can take that would assure you some level of confidence that you are marrying the right person, and your spouse selection method is correct.
You and your family must first rely on finding information about the prospect spouse. A background check from his/her family members, friends, associates, colleagues, community leaders, and so on.
Istisharah is also very important. This means you seek consultation and ask for advice about the situation you are in and who the person is, and their family, and take the advice.
This is healthier than just repeating istikharahs for the same scenario, and not wanting to follow the answer the the istikharah. The first time you did the istikharah, if it did not turn out the way you wanted to, deep inside, then it means that you had already made your decision.
In any case, pay some sadaqah, consult with your family, seek advice, and then decide what you are going to do. Evaluate who they are as far as compatibility, how religious they are, what level of akhlaq do they have, their reputation, and so on.
With prayers for your success.