Same Sex Attraction (persistent thoughts, urges, or desire for sexual activity with your own sex) - this is observed primarily through self and manifests in sexual fantasy, sexual dreams and masturbatory activities. Men who recognize same sex attraction in themselves often distinguish these urges, or traits from actual sexual behaviors. They may be aware of having attraction but have never acted on it. Simple Presence of SSA doesn't make a person Gay or for that matter Bi, only declarations and self actualization / recognition can do that.
You indicate strong Opposite Sex Attraction, you neglect to state your own position on Same sex attraction, but ask if you are Bi. Many men are faced with desire for sexual acts and fantasy that they do not actually engage in. They may masturbate over these fantasies and never fulfill them, leaving them sexually active with only one partner or wife. They may masturbate over these fantasies and only seldom meet another man for a secret sexual act or relationship, leaving them sexually active mainly with their parter or wife and cheat occasionally. Many of them do not identify as Bi nor Gay.
Men who possess desire for sexual activities with both sexes, and self declare that they are Bi are labeled Bisexual. Behavior may lead them to a monogamous relationship, but desire may lead them to predominantly characterize themselves as Bi-sexual.
The labels of Gay, Bi, Straight and Poly lend themselves to the self declaration process of many LGBT people and in this way allow dialog to begin where in a person becomes more open, more comfortable and synchronizes his feelings, his behaviors, and his self declarations.
The usage of SSA as a word, predominantly on Male Survivor, presents as an outpouring of respect for self declaration. Any man who experienced Child Sex Abuse (CSA) at the hands of male abusers may feel some level of SSA as he matures. The use of SSA allows some fluidity whereby Survivors can discuss the presence of emotion and desire or compulsion to without being labeled as gay/bi/lgbt. It also allows those with a high degree of shame, guilt, and internalized homophobia to begin a dialog where they can discuss the issues without being labeled immediately. It allows Gay men who experienced lots of confusion about whether or not they were repeating their abuse some growing room before they begin to come out. It allows Bi men access to a discussion of why they feel Bi, and distinguishes behaviors and outcomes from urges and fantasies.
I hope this has helped.