The thing is that until you have a lot of sex with a few partners, especially experienced partners, you really can't judge the sex you are having with your first partner, especially in its early stages. And many have posted here in the past that they went through something like you and met someone and the sex was okay or good, and then they had sex with someone else and only then did they know the difference!

Some aspects of sexual compatibility over the longer-term are mostly what I listed. The most important sex organ is the mind, and what you do with it. The most important thing is to keep sex fresh and alive and sparkling, despite having sex thousands and thousands of times with the same partner (no easy challenge is that).