Will adult teeth grow in when a baby tooth is pulled out (in adulthood)?!

Adult canine teeth are the most common teeth to go "off course" during development as they have such long roots and take so long to grow.
If your adult tooth isn't in exactly the right position then there will have been no erupting pressure to resorb the roots of your baby tooth and make it fall out as the others did.
Baby teeth aren't designed to stand the pressure of masticatory forces from eating as adults and this is probably why it has started to get loose now.
The best thing to do is get a small x-ray done so your dentist can determine if there is a tooth there at all. If there is no tooth and your baby tooth does fall out then unfortunately the only options are a dental implant or a small partial denture. (its not advisable to damage or crown an adjacent tooth to make a bridge)
Try not to worry or be embarrassed about it!!!! Dentists see this every day :) Get an x-ray done and take things from there. Good luck :)

If you go to the dentist, he can take an xray and see if there's an adult tooth up there trying to come out.