Hi there,
Thanks for writing to us,
First of all do not worry. you are completely normal. Not everyone will get their sexual feelings after seeing opposite sex private parts or breasts. It is your mind what makes you to think which one is pleasurable.
You have your own arousal by seeing their external appearance and their mannerism, This is because you set your mind that this thinks are more pleasurable than the private parts of opposite sex.
Just, explain about yourself to your partner that you have interest over her not only on private parts but over her mannerism and her external beauty.
If needed go for a personal counseling with a sexual medicine specialist with your girlfriend and let her know yourself.
Let me know if you had further questions,
Take care and have happy life.
Regards,

Hello rahulkhanna0909
Welcome to Health Care Magic

You are getting arousal on seeing women taller than you, or thought of lifting men by women excites you, but not getting proper erection on seeing private parts of women, dear friend you are absolutely normal. You are not having any attraction to individuals of same sex, and you get excited only by opposite sex partner so there is nothing wrong. Every men have different fantasies, some people get excited by mere thought of a particular part others get excited by touching etc. So it varies in different persons. Still you are having problem then discuss this with your girl friend and both of you should engage in long fore play and you will see improvement. Don't waste your time in paying visit to different doctors as everything is normal.

Thanks Take Care