Sight reading involve many skills including rhythmic & interval reading, solfege, develop a steady pulse, eyeball movement and etc. Good news is that sight-reading is a complex skill that could be taught.
I have been teaching sight-reading over the past 10 years. Many of my students are able to read, some became confident music readers after having sight-reading training with me. A competent sight reader could use his/her skill to learn song faster and feel motivated to pursue a higher level of their music education. So don't give up yet. Call and see what we can do to improve your music reading ability.
Preparation for AMEB/ABRSM sight reading examination is also available.