It's understandable that you may feel upset and disappointed about not getting your own room after being told you would have one. It's natural to have feelings about the situation, and it's okay to express those feelings to your mom in a respectful manner.
However, it's essential to remember that feelings of guilt are not necessary in this situation. You didn't do anything wrong by expressing your emotions or being disappointed about the decision. It's natural to want your own space, especially as you grow older, and it's okay to advocate for your needs and preferences.
Keep in mind that family dynamics and decision-making can be complex, and parents may have various reasons for their choices that you might not be aware of. Your mom's decision may have been influenced by factors you are not fully aware of, such as the need for your brother and sister to share a room for practical reasons.
Instead of feeling guilty, try having a calm and open conversation with your mom about your feelings and concerns. Communication is essential in family relationships, and expressing your emotions can help her understand how you feel. While the final decision might not change, expressing yourself can lead to better understanding and might pave the way for future discussions about your needs and preferences.
Remember, it's okay to have feelings and express them respectfully. If you find it challenging to talk to your mom, consider talking to another trusted adult or family member who can support you and help you navigate your feelings.