The answer to this question can vary depending on the laws and cultural norms in your specific location. In many places, the age of consent is the legal age at which an individual can engage in sexual activity and enter into a romantic relationship with someone else without it being considered a crime.
If the age of consent in your area is 18 or older, and you are under that age, engaging in a romantic or sexual relationship with an 18-year-old could potentially be illegal and may have serious legal consequences for the older person.
Additionally, there can be significant differences in maturity and life experiences between a 15-year-old and an 18-year-old. It's essential to consider whether both individuals are on similar emotional and intellectual levels and can provide informed consent to enter into a relationship.
It's crucial to prioritize your safety, well-being, and compliance with the laws in your area. If you have any doubts or concerns, it's a good idea to discuss the situation with a trusted adult, such as a parent, guardian, or counselor, who can offer guidance and support.
Remember, it's essential to be in a relationship where both parties are comfortable, equal, and respectful of each other's boundaries. If there's any uncertainty about the legality or appropriateness of a potential relationship, seeking advice from a responsible adult is a wise step.