Assalamu Alaikum
I'm not sure how you prayed istikhara because it does not sound as if you did it correctly.
Istikhara is sunnah, so don't worry about it being bidaah, it's not. The prophet (pbuh) used to pray it up to 7 times. Also, dreams aren't sure signs for your istikhara. Istikhara depends on how you
feel after you pray it and if things are happening in your favor, meaning if they are leaning towards what you asked about or going against it by creating obstacles between you and that which you asked.
Inshallah you will find some great information about how to pray istikhara properly and what to look for afterwards
here.
If you have any questions, be sure to ask inshallah (:
fi aman Allah
w'salaam