I think the best thing for you is an accountability person. I have a sexual accountability group at college that meets Tuesdays and Thursday nights, and I can tell you it's helped me a lot in controlling both my thought life and actions. It's a real turn off to my own temptations to have to tell a group of my friends what I sinned in. So I'd find someone who can be there to ask you how you've been doing in that area and who will love you, but also get on you about control and purity and build you up.
While having bisexual urges is definitely a struggle, it's no different than any other kind of sexual struggle. It's all sexual immorality, it's no worse than heterosexual sin in thought and action. They're in the same class, all sin. So don't think that because it's bisexual urges you're doing something that's kicking it up another level. But find help in friends and stay in the Word. Staying in God's Word daily will help to keep perspective. And lastly don't reside in guilt. Jesus died so that there would be no guilt if you are in Him. He paid for all of that. Beating yourself up mentally and physically after sinning is like saying that the sin isn't fully covered and more must be done; but Jesus took ALL of that. His grace abounds. You just have to trust what's done is done and when you slip ask forgiveness and just fortify yourself for the next attack of temptation. I hope that helps some? You're definitely not alone though. Sexual sin and the struggle with that is rampant, but we don't have to live in defeat. We're not dead anymore, we're alive in Christ.