Hi, ChizukSC,
I'm not the right person to respond about this, since I am just starting to learn how to live.
I have an attraction for my wife, and a want for intimacy. I am learning that intimacy doesn't need to include emission of sperm. I'm learning how to be intimate on a emotional level, or even physically without sex.
Hashem has designed the sex drive, I think, in order for people to procreate the world. However, I think, the concept of Marriage is to elevate the drive and become a giver instead of a receiver. To focus on her needs rather than yours.
Don't worry too much, worry can cause wet dreams too.
Do you have a Rov, Rebbe, Mentor, etc... you can speak to? If you don't feel comfortable about talking about your acting out problem, perhaps just some hadracha how to approach dating, and you can ask him what to do about thinking about what comes after marriage, how dating is hard because of it raising your taavah.
Try to open up to real safe people. Mentors get these topics everyday. No one would judge you.
Hatzlocha Rabba!