You are still young, so your skin is still pretty elastic. I would think that eventually it will get better. You probably didn't lose 100 pounds overnight so you'll have to be patient.
Just keep doing what you are doing and keep watching the results. If it bothers you a lot I would recommend sticking a little into savings from each paycheck and then find a reputable plastic surgeon in your area to help remove the excess skin.
Keep working out, keep eating right, give your body time to adjust. If it keeps getting better you can take that money you saved and buy yourself something fun that you want. If it stops getting better and you still don't like it you can then get it taken care of.
You've lost 100 pounds! That is amazing. That is what they will think. Sure, there are jerks out there, there are pretty shallow people out there...but do you really care what they think? How many people can say they have lost 100 pounds? Not me. When I reach 100 pounds of fat lost I fully expect to have saggy skin and I'm not as young as you so chances are that it won't bounce back as easily.
Just make sure you are exercising, eating plenty of fats, drinking plenty of water, and you should continue to see great results.
And remember, the people who care don't matter and the people matter don't care.
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