It can be challenging to integrate internalized prejudicial attitudes with the more accepting and open-minded belief system many people develop with age, education, and maturity. Consider your reaction to first learning about heterosexual activities. Most children have a disgusted reaction to hearing about putting one's tongue in another person's mouth or inserting one's penis into another's vagina. Over time and with increased exposure to the idea of heterosexual sex, however, most of us resolve our initial disgusted reaction and come to enjoy such activities. With increased exposure to the idea of homosexual and lesbian relations, people who feel disgusted may find their attitudes and values changing in a more constructive and accepting way.
Heterosexuals have histories of failure in relationships.
Your heterosexuality doesn't offend me as long as you don't try to force it on me. There seem to be very few happy heterosexuals. You might be able to change if you really want to.