The reality is that our culture has separated intimacy from sex and sex is a minor part of intimacy. The problem is that you are designed with a need for intimacy, and when the culture says the only way to get intimacy is through sex, you are left feeling left out. The reality is there are 4 types of intimacy; intellectual, emotional, spiritual, and physical. Sex is only a minor part of physical intimacy.
If you want to find out a lot more about this subject please read https://www.amazon.com/Seven-Levels-Intimacy-Matthew-Kelly/dp/1942611420/ref=sr_1_1?ie=UTF8&qid=1546528475&sr=8-1&keywords=7+levels+of+intimacy+matthew+kelly
That said my suggestion is that you find a mentor because a mentor is the best place for a single guy to practice intellectual, emotional, and spiritual intimacy. Once those three things are developed you will not feel left out.
The sensation that nobody really knows us can be one of the most debilitating forms of loneliness, and is fostered by our unwillingness to reveal ourselves. The paradox that we want to be known and loved for who we are, but refuse to reveal ourselves because we are afraid of rejection, creates a tremendous loneliness in our lives.
It is here that we come full circle. We yearn for intimacy, we run from intimacy, we tell ourselves that we need to be free from emotional ties, but we end up in slavery of one sort or another.
Unwilling to participate in the rigors of intimacy, we try to fill the void created by the lack of intimacy in our lives, and thus are born our addictions. The bottomless pit that is created by the absence of intimacy demands to be fed, and if we refuse to feed it in a healthy way, we will find ourselves feeding it in ways that are self-destructive. Some try to fill the void with alcohol, others with shopping, some with drugs; others will fill it with unending series of short-term relationships, and in a culture that equates intimacy with sex an ever increasing number of people try to fill the void with sexual experiences. The result is a growing emptiness. Each of these is just a different attempt to fill the void created in our lives by a lack of genuine intimacy. All addictions are the result of trying to fill that void in an unhealthy way.
The Seven Levels of Intimacy https://www.amazon.com/dp/1942611420/ref=cm_sw_r_cp_apa_AMrSBb8WPDM43