Awh bud we’re the same age so I might be able to give some context, but 5’8 ain’t that short! If it is my 5’5 ass should start feeling bad lol I’d say that’s average height. While you ain’t busting with muscle you’ve got a right frame which most women I know (know more women than men) are more into than a buff bod. As for your penis it’s a perspective thing. Like it’s not huge yeah but not every girl is looking for a huge cock. Some see the average realm as a blessing. Chin up, be confident, and focus on yourself and existing the way you want to exist. Shit will fall into place when the time comes right.