Sounds like a fairly normal 23-year-old to me, too. Most of the guys around you are having similar struggles and are also embarrassed by it. .
Hi Ram masturbating 4 times a week is not exssecive, if it was 4 times a day that would be excessive, your just somebody with a fixation on tall women an fantisize about them, as men we fanisize about lots of things. its ok your just normal. when you get to masturbating more than once a day everyday then you have a problem, but your OK
Good luck