Hello there! I would be happy to help you troubleshoot your whipping cream issue.
Most likely, the problem is a combination of temperature and fat content. To whip properly, your cream needs to contain at least 30% to 36% fat, and it must be thoroughly chilled. If the cream or your mixing bowl is at room temperature, the fat will not trap air efficiently. I recommend placing your bowl and whisk in the freezer for about ten minutes, and ensure you are using heavy whipping cream rather than light cream or half-and-half.