You sound to be very unhappy generally and maybe you should focus on finding your self confidence and knowledge of the world just now. Park the search for a relationship and a 'man' as not for you right now.
Yes be aware many men are manipulative, want sex and want power. This equals distress and unnecessary grief. If you search for a relationship when you don't understand who you are and what you actually want will lead to many men assuming the way is clear for them to 'walk' all over you. Go into any relationship with your eyes open. Ask yourself why someone is professing love in the way they do as yes they might be fake and want either sex or your money or a visa. If you don't feel love don't link in with them but keep them as a friend. It's ok not to love someone, and maybe you never will. But in the same way you like tea, coffee, water, juice you can decide to turn down a man and know they are not for you.
Have confidence to know you do not need to have a man to make life good. You might be surprised at how life pans out when you stop thinking you need someone to have a relationship. Just stop thinking that your number one issue is a lack of a relationship, it is much more common than you think and many people now don't find any 'love' until they are much older, in their 30's, 40's. Be choosy you need to meet many hundreds of men to find someone you love, and even then they might not love you back. Life is hard that way. Make sure who ever you have a relationship with is the right person for you and not just 'someone' because everyone else seems to be having a good time with a 'man' Looks are deceptive, and if you hook up with someone who does not treat you like a million dollars - ditch them.
Explore life as much as you can. If you work get to know your colleagues, go out with them at every opportunity. Find your own life interests and understand yourself much more. You do not need a 'man' to be happy but any relationships you do have should enhance life not make you feel far worse. If you don't work volunteer and meet others. Put your heart and soul into doing something for someone else to make their life a little bit better. Look at every single plus or positive you have that is good. Start physically with every part of you that works. If it doesn't work well, make it work better. Look at the world around you, get a passion for trees, for birds, for wildlife, for mountains, for boats, for planes, for how everything works and interacts. Look at everything in your life, diet, exercise etc. Start running, cycling and look for a group that meets and find your feet there. Join a walking group and join them, some are advertised at health centres, explore history around your area.
Keep trying everything there is on offer around you just once. Look at the Buddhist's principles of calm and way of life.