Do you ever have an idea or a dream, and then before you can seek God about if or when that dream is for you, you dismiss it because you think it is impossible to attain?

Our faith reality includes impossibilities.  Take that desire, dream, vision, or goal to God.  When He confirms, edits, or enhances that dream, begin your faith fight knowing that God will make all necessary provisions for that dream to manifest.  Begin the works that you can do toward the manifestation of that goal, and allow God to work out the impossibilities (the things seemingly out of your control).  But remember to stay in faith and do not be moved by what you see.

Hebrews 11:6 But without faith it is impossible to please him: for he that comes to God must believe that he is, and that he is a rewarder of them that diligently seek him.

Romans 9:23 Jesus said to him, If you can believe, all things are possible to him that believes.