I married 2 years back and have the similar issues. I had some relationships with sexy looking girls in past and so not turned on by my spouse whom I admire and love a lot.

Evn while having sex, I try to give pleasure to my spouse but do not enjoy myself.
We have sex like once a month. Could someone tell me some tips to come up over this psyclogical barrier, I am from a place where you do not find good counsellors easily.
Please suggest.

While you may love her, or find her to be an admirable person, you are not sexually turned on by her. You need to try and become more sexual with her, and see if you can spark desire.
Maybe some time away together?

Was this an arranged marriage?

Try some sexy games that may allow each of your to role play a little. Change where you are having sex, what you each wear (or don't) during sex, etc.

In the end, if you don't find your spouse sexually attractive, this will ultimately ruin your marriage. You will need to work hard to create that spark if you want to keep this relationship going.