Well, I know how you feel. I was a tall, skinny guy all thru high school, into my twenties and even into my early thirties. When I hit middle age I began to fill in. Odds are you will too. Just be careful that you don't fill in too much and in the wrong places. When I was young I could eat whatever I wanted and never gain a pound. I had to abandon my old eating habits and re-train myself when I hit forty.

Believe me, however, that you are VERY desirable just as you are. There are a LOT of gay men who positively worship skinny young guys.