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Consult your owner's manual. It sounds like possibly you don't have the bobbin threaded in the bobbincase properly. The bobbin must spin (either clockwise or counterclockwise per the manual) a certain direction and the thread needs to be threaded in the bobbincase in order for the bobbin to turn.
Consult your manual to confirm you have threaded the upper thread and bobbin thread properly. Is the needle installed with the flat side facing the right direction? Did you remember to RAISE the presser foot before threading the upper thread? Are you pulling at least 4-6" of thread through the needle's eye and through the bobbincase before you begin to sew? Once the machine is threaded (top and bobbin), can you manually rotate the handwheel one complete turn and pull the bobbin thread to the top? Like this: How and Why to Bring up the Bobbin Thread
If the bobbin thread does not come up, then your machine probably needs service.
Get a manual for your machine so you know how to properly thread the machine - you need to be sure the thread goes through the guides in proper sequence and - ALWAYS thread a sewing machine with the presser foot up.
You need to be sure the bobbin thread is feeding in the correct direction from the bobbin spool and through the correct guides.
Check the needle to see if it is installed correctly and is not bent.
Most sewing machine needles are installed with the flat side toward the back of the machine.
After proper threading and bobbin feeding, hold onto the top thread tail and lower the needle down and back up to pull up the bobbin thread.
Take both thread ends under the presser foot and to the back of the machine.
You did not provide the make and model of your machine so I can only suggest if you do not have a manual, search the Internet. Singer and Brother have downloads. Sewusa has many brands/models.
Drop-in bobbin: Note: thread must change direction when entering bobbin shuttle notch. Usually bobbin will turn counter-clockwise when threaded properly.
1. hold bobbin so that the tail of thread is facing to left. 2. drop bobbin into bobbin shuttle. 3. pull thread toward you. 4. guide thread into notch and pull to left so that slot engages thread. 5. pull thread diagonally across shuttle toward back of machine. 6. draw bobbin thread up through needle plate with threaded needle.