That's ultimately a question you get to answer for yourself, because only you get to decide how you identify in terms of your sexual orientation. Now, that may feel a bit overwhelming, but what it means is that you don't have to worry about getting it right because you, and not someone else, get to determine how you feel and what that means. So, if you feel like you're only experiencing attraction to guys and therefore gay is the right term, you get to make the choice to use that label (or no label at all)
Too, it may help to keep in mind that sexual orientation can be fluid for many people. So it's okay to identify as bi at one point and gay at another. That doesn't mean you were wrong about your identity, it just means you were (or are) operating with the information that you had at the time. Does that make sense?
If you haven't already done so, I suggest reading through this article: The Rainbow Connection: Orientation for Everyone
. Are there any identities in there that feel like they match your experiences?