Ok, Rubrum.. Some of what I am going to say you probably won't like.  Probably others won't like it either.  But I'll say it anyway.  It is intended as friendly, but some of it will be a bit blunt.

Let's start with your motivation.  At least from what I have heard of it from your initial post, you figure you want to "like to learn and share the music to many people" and you were inspired by the idea of being a professional because you saw someone in concert.

Weak.  Seriously weak.  Is that really all you've got?

If so, then I can tell you that there are several noobs here I can think of off the top of my head where I could bet the rent money that they'll still be playing 5, 10, 20 yrs down the road while you won't.  They love playing, they love the sound, they're hooked on the idea of being someone who makes music instead of being just someone who pushes the button to hear what somebody else made.  Some of them aren't even comfortable yet with the idea of playing in front of other people, but they love playing.  They have at least the beginning of the passion that makes a musician.

If you think you don't want to play unless you can be a "success".. Then you don't have what they have. 

But hey, I could be wrong.  Maybe you just didn't state your motivations accurately, and you really do have the fire to play.  Cool.  Prove it.  LOL 

Thinking of "giving up the dream" at 28 whole years old?  I'm 51 and just started a few months ago.  Well, just started on violin.  I've played other instruments since my teens.  If I had given up at 28, I would have missed out on some gigs that are very fond memories at this point.  I'm not gigging at the moment because of other things in life, but I might be tomorrow or a year from now.  Who knows?  I still play though, because it is one of the good things in any day. 

Which brings us to another point.  You haven't found much time to practice in two years?  There's quite a bit of time in a year, sounds like maybe you didn't look real hard for the time to practice.

Now off the griping and on to a little advice.  Even if you get good, there's a bit more to getting gigs than that.  I don't know for sure what kind of music you want to play or what type of orchestra or gig, but audition for anything you can that is in the general direction of where you want to be.  Even if you know you aren't good enough.  Every time you get turned down, you are likely to learn one or two ways to not get turned down a bit further down the road.  Don't worry too much about being a pest.  Pests like that often get gigs.  Or at least get told what they'd need to get one. 

If there isn't anything local, then you need to consider moving.  Make friends who are musicians in your area, because musicians know about positions coming open before anybody else does usually.  Sometimes if somebody knows somebody, there isn't really much of an audition.  That somebody could be you.  At the very least if you have friends playing in the sort of orchestra/ensemble/band that you want to play in, you'll get some realistic expectations of what it takes to do well.   You need to do a bit of networking.  If there's a knock on your door related to your playing it is always much more likely to be the cops over a noise complaint than a talent scout.  If you want opportunity, you'd better be the one to do the knocking because it doesn't usually come looking for you.

So anyway, maybe I have you all wrong.  Maybe you were just having a discouraging day and you are actually realistic and love playing music.  Cool.  Prove I'm wrong.  I would honestly enjoy seeing that I am wrong in my perception of you from your two or three posts so far.. Anything is possible.