I've had mild scoliosis since I was a teenager, but it didn't really bother me and I didn't do much about it. Usually when I walked I didn't keep my back straight, it was slightly leaning forward so my posture was pretty bad.

After 5 months of regular workouts in the gym, the people that know me the most, are saying that my posture has improved drastically and I'm keeping my back straight as I'm supposed to be. They think that the working out I've been doing regularly has something to do with it. Do you think this might be true?

Yes working out is helping your posture. I have a similar problem. You are strengthening your core muscles which helps your spine and posture.

I don't slouch half as much since I started at the gym. Makes me feel more confident to sit upstraight and with my shoulders broad since I've been going as I've got bigger, I used to be even skinner than I am skinny now.

Aloha & HowZit!

Physical Progressive Exercises with the use of Progressvie Resistance Equipment can help people who live with various degress of spinal-scoliosis.
What you should try to avoid is is weight-resistance exercises that involve added downward and lateral stress or compression to your spine.
Stretching by hanging is an added benefit that can compliment your resistance training provided your breathing and posture are ideal.
What it is you are gainning through your workouts is called:
"Postural Awareness and Bodily Wisdom" that secures your "Essential-Core"
while physically moving through the exercise.

Keep in mind that Progressive Resistance Exercises (PRE) requires and in your case will demand you to understand-while-doing and learn the various degress of different exercise-postures when using weights. You will be standing, sitting down at angles, lying down and most of all carrying weights around. All of these physical movements means that you must be aware how you will secure and maintain the right kind of posture during your workout time.
These exercise positions and its movments allows you to carry out what you have and we still be gainnng beyond the walls of the gum facility into your active daily living-life.
But don't there, keep your yourself educated and learning what needs to be recognized. You might be helping another person with their "physical-postural" circumstance one day.

Good Health To Yo!
mikey "Q."

I first started to help my posture, and it has improved, I always slouched. makes a big difference.