You are entitled to litigate your ERISA disability benefits claim, but you must first exhaust all the administrative remedies that are available to you.
In the context of ERISA, this generally requires that you challenge the adverse decision of your insurer through the administrative appeals process. The administrative appeals process — and its mechanisms — can vary quite significantly from plan-to-plan, but if you do not go through the applicable administrative appeals process, you will not have the right to sue for benefits/compensation pursuant to litigation.