First off, congratulations on moving forward in the world. You can try to do more -succeed or fail,but try - or keep throwing drunks out until one hurts you badly.
Being older gives you an edge. You have seen a bit of life. You are responsible for yourself, and don't wait to be instructed/told what to do every step of the way.
If you are in the US, I believe you need to complete a four year college before applying to vet school, don't you? I am not sure.
Either way, one option is do go to your local community college. Take a science refresher- and a subject you know you'll need but have long since shaken out of your noggin - I would suggest you go for a math course. You'll find a surprising amount of math in vet work. This will get your brain back to work, give you confidence, and get you "in the zone."
People are going to tell you to apply everywhere... of course it costs some $$ each time you apply - so start saving money now!!!
Try to find a full or part time job at your vets. Large or small animal. So much you can learn hands on! Here's a hint - for large animal, if you practice and can properly restrain a cow, 3/4 of the battle has been won! I see lots of vet students come through here, and that is the one thing they are very very weak on. Also, this experience will help you with your vet school admisson.
Good luck, and keep us updated!
"There ain't no vaccine for stupidity* Maxine