many people transition without surgery. you can changed the way you dress or you're name and pronouns. only 3% if the trans community has had surgery. but if you don't your still very much valid in the trans/lgbtq+ community
Just because you have a certain body type doesn't mean that you are not who you identify as. Even if you have a more feminine body, you can still identify as a male. Surgery is not what makes you transgender. Hope my explanation helped