All perfect praise be to Allaah, The Lord of the Worlds. I testify that there is none worthy of worship except Allaah, and that Muhammad is His slave and Messenger.
First of all, we welcome you in our site and we thank you for visiting it.
We do not see any prohibition in looking for a wife through the internet, provided the religious requirements which are mentioned in Fatwa 84396 are met. If those requirements are met, it is permissible to look at your future fiancée on the internet and it is not a condition for her Mahram to be present with her since you are not in physical seclusion with her.
However, we have already issued Fataawa 84929 and 85082 clarifying that the best method for looking for a wife is through trustworthy acquaintances.
As regards your feelings when you look for a wife through the internet, then you are not sinful for that as long as you do not give way to these whispers of the devil or do a forbidden act, like looking at non-Mahram women and the like.
It should be mentioned that the best thing for a person at your age is to stay away from the internet as much as possible so that the devil will not open the door of temptation for you and then it will be very difficult for you to close it. Being safe regarding one's religion has no rival. We ask Allaah to purify your heart and preserve you from illegal sexual acts.
With regard to your thoughts, you are not sinful as long as you do not talk about them or act according to them. As regards the white fluid that you have, it is called Mathy. It is impure and it is an obligation to wash your sexual organ and wash the clothes that are stained by it. However, you are not obliged to perform Ghusl when you have this discharge. Similarly, you are not obliged to perform Ghusl when you urinate; you are only obliged to wash after relieving yourself (either after urinating or defecating).
Urine does not come out with desire, and looking at the (future) fiancée with desire is something which is permitted by the Shaafi'i School of jurisprudence, but this is a very weak opinion.
Moreover, the Hanbali School of jurisprudence permitted looking more than once at the fiancée when there is no temptation.