7 months is only a short time to be sexually active. Sometimes it can take a while, first to learn the right techniques and then for your body to learn to respond.

It's highly unlikely that you have any physical problems, it's probably just a matter of experimentation.

Have you tried masturbating on your own with your clit?
With your partner there it can complicate things initially. Sometimes its better to learn on your own. In the long run it'll be better for you both.

Put aside an evening just for yourself, build up to it like normal sex, with foreplay, but on your own. Then try rubbing your clit in different ways. Just try stroking it with different pressures, speed, directions. Maybe use some moisture, saliva or oil. Don't focus on having an orgasm, just focus on what feels nice and pleasureable.

And don't forget to come back and let us know how you get on!

I heard that Volupta can help to get orgasm. I found more on google about it.

Relax, enjoy, don't feel hurried or worried. Explore yourself when you are alone or with your partner. Learn for yourself what feels good to you, how to bring yourself to arousal and orgasm. That will help but be patient and easy on your thinking. You have only just begun so the saying goes. Explore yourself and enjoy pleasuring yourself and being pleasured the rest will come with your body being comfortable with yourself and your partner. Ask yourself if there are any head problems you are having as in guilt etc. Check that part of yourself out too.