My aunt opened a bank account on my name in England since May 2019 with 3500 pounds. Can I use it as my bank statement?
Yes, if the bank account is solely in your name, and you can withdraw money from it whenever you want, then you can use it as evidence that you own that much money.
UK immigration require you to provide details of your entire financial situation, including day to day transactions. If you have not been using this account for your normal banking, and especially if there have been few transactions since May 2019, then you will need to provide additional evidence of what your day-to-day finances are like. A single bank account with little activity will not satisfy this requirement.
This answer will give you much more information about what you need to provide by way of financial information.