In economics it is known as a sunk cost. It isn't rational for one to consider costs already incurred an paid for when determining a future action, but many people still do. From Wikipedia on "sunk costs" (bold emphasis mine):
In economics and business decision-making, sunk costs are retrospective (past) costs that have already been incurred and cannot be recovered. Sunk costs are sometimes contrasted with prospective costs, which are future costs that may be incurred or changed if an action is taken. Both retrospective and prospective costs may be either fixed (that is, they are not dependent on the volume of economic activity, however measured) or variable (dependent on volume).
In traditional microeconomic theory, only prospective (future) costs are relevant to an investment decision. Traditional economics proposes that an economic actor not let sunk costs influence one's decisions, because doing so would not be rationally assessing a decision exclusively on its own merits. The decision-maker may make rational decisions according to their own incentives; these incentives may dictate different decisions than would be dictated by efficiency or profitability, and this is considered an incentive problem and distinct from a sunk cost problem.
Evidence from Behavioral economics suggests this theory fails to predict real-world behavior. Sunk costs greatly affect actors' decisions, because humans are inherently loss-averse and thus normally act irrationally when making economic decisions.
Sunk costs should not affect the rational decision maker's best choice. However, until a decision-maker irreversibly commits resources, the prospective cost is an avoidable future cost and is properly included in any decision-making processes. For example, if you are considering pre-ordering movie tickets, but have not actually purchased them yet, the cost remains avoidable. If the price of the tickets rises to an amount that requires you to pay more than the value you place on them, the change in prospective cost should be figured into the decision-making, and the decision should be reevaluated.
The choice of how to spend one's time and one's life is just another economic decision that many people make irrationally, taking sunk costs (time already spent) into account when it really has no bearing on a decision for a future life course.