There is currently a backlog of about 69,000 unconfirmed Bitcoin transactions and only the transactions with the highest fees will be confirmed until the backlog clears.

Please help me!

For similar situations going forward, you have a few options:

1. Submit your transaction to the ViaBTC Transaction Accelerator
2. If you control either of the receiving addresses, send a new transaction from one of them with a much larger fee, encouraging a miner to pick up the whole chain of transactions (Child-Pays-For-Parent).
3. Wait. The transaction should be either confirmed or removed from the memory pool within about 72 hours.

21.co has a good fee estimator for future transactions.