Wow congrats on being there for your Son and being the kind of dad I wish my son had...

Although a female I know EXACTLY how you feel... I grew up as a only child and while it was ok at the time as mum was a single mum.. she re married when I was 8 and had 2 other kids 3 years apart.... they are now 17 and 14 and I really wish I had a sibling around my age.. I often dont feel totally apart of the family when im around them.. i feel like the odd one out... and I dont want to have that feeling passed onto my son should I find someone down the tract.

I never really wanted kids but now that I have my son a family is just what I want, although I would like to have another before im 30.. im 26 now so that doesn't leave me a whole lot of time.. ha ha

I think that if you dont stress out about it something good will happen.. your only 22 you have PLENTY of time.. for now you just have to be the best dad you can be for your little boy...