Almost definitely. As part of building a business, capital is essential for expansion and growth.
When a business seeks additional investment, the company creates new shares and sells these to new investors. Since the total number of shares of the business goes up, this results in a smaller percentage of the business owned by the original investors (called dilution).
Adding new investors will result in dilution of your ownership but this isn't necessarily a bad thing. New capital often means that the company is continuing to grow, the value of your shares are increasing, and that others believe in the business like you do. If the company is doing well, and the value of the business has gone up since you invested, this new round of investing is called an 'Up Round'. While your ownership percentage has gone down, it also means that the value of each of your shares has gone up, and indicates a positive return on your investment. Future funding rounds are a healthy and natural part of a successful business journey.
In some scenarios, new funding is needed when things are not going well for a business. This can result in what the industry calls a 'Down Round', which is the sale of shares at a lower price point. This is not good for founders or earlier investors, but is a better alternative than a business going under.