I just had a aortic valve replacement surgery and it was replaced with a cow valve. am i going to be okay in the future?

Yes, for many years: An aortic valve is replaced with either a tissue valve, like yours, or a metal/plastic valve. The plastic valves should last for a lifetime, but require you to be on blood thinners for life, which are at best a nuisance and at worst dangerous. Tissue valves do not need blood thinners, but are only expected to last about 10 years, so re-operation may be needed.