That's my first time to wear lenses but I can't see well with them. I used to see well with the glasses even the old ones but the lenses are different. Need your advice.

I am not an eye expert, but can just add a few experiences I have had, and a few things I have read.
Consumers Reports recently evaluated the accuracy of eyeglass prescriptions and found that a large % of prescriptions are not accurately filled by many suppliers and vision centers. They found one provider that did much better than the others and I assume that you can find the article and make your own judgments. I did and recently got the best glasses I have ever had. That is just one possible problem.
#2- your vision may have changed.
#3- you may have a medical problem affecting your vision
#4- you may be taking medications that are affect your vision.
All or any of the above (or others I haven't thought of) can be investigated by an Ophthalmologist (an M.D.).

Are you talking about contact lenses?