There's no simple answer to this question because there's a wide spectrum of sexual orientation. The important thing is to pay attention to your feelings and to figure out what feels right for you. Many people find that they're interested in girls or boys, or both. Some people find that they have a strong attraction to men, while others are attracted to women or nonbinary people. The way that you experience these feelings may change over time.
Some people develop crushes on their favourite teacher or their friend's older sister, which doesn't mean they're gay. Others are attracted to members of the opposite sex, and some even find themselves attracted to their same-sex friends. This can be confusing, especially if you're exploring your sexuality, but it's also normal and okay.
It's possible to think you're gay when you're not, but it's equally possible that you'll realize that you're straight later on. The important thing is to listen to your instincts, and to be patient with yourself.
If you're having trouble dealing with your own sexual orientation, or if you're struggling with family and friends who don't accept it, counseling is an option to explore these issues. There are also a number of LGBTQ support groups that can help you connect with other people who share your experiences. If you feel like you need more support, don't hesitate to contact me and schedule a confidential session. Together we can work through your challenges, and start to celebrate your uniqueness.