I cannot balance my balance sheet

You need to check your account balances for incorrect postings. Assets have a normal Debit Balance, Liabilities and OE have a normal credit balance. Did you incorrectly list a debit or credit account balance. Did you transpose a number somewhere. Did you miss part of journal entry like forgot to debit or credit an account.

I would use a worksheet starting with a trial balance or adjusted trial balance and if it balances, then you can balance your income statement and Balance sheet. You will need to add debit or credit amount to your income statement to get your debits and credits to balance, then this amount you added will be added to balance sheet as the opposite to your retained earnings. For example if your income statement needs to have a debit amount added to get it to balance, then you will have to credit the same amount to your balance sheet so that your debits and credits will balance.
Without knowing your accounts and transactions, as well as what you have done I cannot tell you why your balance sheet does not balance.