Ihcho - I am a professional orchestral musician who also has a music theory degree. I am trained to train people's ears, and have helped many in the past, and would be happy to give you some advice if you want to send me a private email. There is some good advice in the above posts, but if you wish, I can direct you to some books that will help you train your ears to enjoy music more.
One book I can highly recommend to anyone interested in learning more about listening in general is one called "What To Listen For In Music," by the famous composer Aaron Copland. It is well written and easy to follow without being dumbed down.
Another piece of advice when attending orchestral concerts, and this goes for pretty much any concert hall - do not sit TOO close to the front. Sound travels up and out, so sit more towards the back than the front, though not under an overhang if you are on the floor. In many halls, some of the best seats are in the front section of the second or third tier of the hall, depending on how many tiers there are (and assuming there is not a "roof" over your head from the next tier up). There is often relatively better sound in the so-called nosebleed seats than in many other areas, again depending on design, especially in not-so-great halls. Every hall is different, of course.