I don't have any problem to find sex
And sleep with women.
I'm trying to find a woman to marry.
I slept with 20 girls and I had 3 relationships
And none of them less for a long time.
All this women they don't fall in love with me.
How can I approach a girl make her in love with me
And make her marry me ?

Fuck her good.

and don't rush it which seems to be the case...

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USER HAS BEEN BANNED FOR REPEATEDLY IGNORING MOD WARNINGS AND MULTIPLE RULE VIOLATIONS

You can't "make" her do anything.

It's extremely easy to get a girl to want to marry you provided that:

-You're in a certain age range. In the US ~22-35
-You are relatively well-groomed.
-You have an even only mildly interesting personality
-You have relatively good "prospects" (i.e. an education, steady job, good background, no serious personality flaws or baggage [like a serious mental disorder or a criminal record)
-You are not hideously ugly.

I'm assuming that most of these apply to you.

You need to tell us a little bit more about where you're at in life. Age, hobbies, employment/education, background on past relationships and why they didn't last/how long they lasted etc., P.S. Why do YOU want to get married?

Generally speaking though, just lay them first, don't bring up the relationship status discussion (wait for her to) and don't give off hints that you're not ready/don't want commitment. Just have fun, spend time with her, be a decent human being and if she happens to be at a place in her life where she might be considering marriage (the age range I mentioned) plus is the type of girl who wants to get married (the vast majority do - marriage is an institution that benefits women above all), things will progress naturally and she will initiate virtually everything except "popping the question" itself, and even then she'll basically take care of that, too with incessant and transparent hinting.

*Drake voice "Dont do it, please dont do it"

Well, social psychology states we're influenced by our social settings/external social influences, as in those who are part of our social group which is comprised by age, interests, hobbies, etc., etc. The greater circle is the pressure from society as a whole to marry by a certain age and have children and what is/who is acceptable to be with and marry. Women in their 30s are looking for marriage and children because society tells them(And men) that this is what they should be doing so they tend to get a bit crazy at that age trying desperately to grab onto anything in order to reach this goal -- something that could actually have a huge influence on the high divorce rates in modern society(Marrying the wrong person because you rushed into it in order to attain a goal).

You should be able to find a woman that's willing to settle down once you engage in a relationship without much effort other than being willing to be with her and have children. Of course that's not to go without saying you need to display siring qualities to potential children and provide basic survival needs to her as well. You need to be able to provide basic needs(Food, water, shelter and comfort). Meet these basic needs and be willing and a woman in the age bracket of 30-40 that's single will see you as a catch. You only need to be average looking and maintain any kind of conversation with a woman in order for her to be engaged.

Basically, meet a woman, have a job and have your own place. You also need to know where to look. It's no secret that you're not going to find marriage material in ONS situations so stay clear of clubs if you're searching for women to have an LTR with. Once you have someone simply express a desire to settle down and she will grow attached to this idea with you if you cover the bases(Survival and basic social skills with her, her friends and her family).

Finding a woman to marry is not always easy. You first have to decide on what you expect from your life partner & see whether you can get them from women you meet. It takes little time of course. Don't be hurry.