Lust is easy, you just have to find someone you can connect with on a superficial level and spend time with them without either friendzoning or chasing them away. The better your skills, the more of a success rate you'll have. Its important to get good at this bc your gonna need some of these skills, so a good place to start is The Game by Neil Strauss, focusing especially on his breakdown of inner game vs outer game, as the philosophy he gives is pretty spot on. To simplify it all, outer game is your appearance and expression, its your body, your clothing style, hair, make-up, posure/body language, speechcraft, and above all else, emotional energy. Its what determines how people judge you on an immediate superficial level. This outer game is an extension of your inner game, of who you are and what state of your life is. Inner game is key to finding a relationship, or at least one that's not based purely on physical affairs.
Your problem exists in one of these two areas, and to save me the time it takes to speculatr this is where some backstory would help...

Remember that this is the internet so it goes without saying that you shouldnt be too specific with your replies but I have a few questions that may seem personal but how you answer is a little more important than what you answer so dont worry too much about the details but please be honest:

How would you rate your physical apprarance(1-10)?
How do you think others would rate your physical appearance(1-10)?
How confident would you say you are when you talk to people you'vejust met?
How confident do you feel when speaking to someone you feel is more attractive then you?
How attractive would you say your best friend is?
Are the crushes/people you are attracted to part of your friend group or just people you meet?
How satisfied are you with your home life? Your work life? Your financial security?
How would you describe your physical fitness/physical activity?