Am I worrying too much about not having another baby yet ?

My son is now 4 , I've been single 5 years this year In August and amongst everything all I want the most is to have another child. People have had kids a year or two after I had my son and they already have another kid and are even pregnant with a third while I'm here still single

I turned 27 in January and I'm aware that time doesn't slow down for anyone and I want my son to have someone to play with without there being a big age gap, all I want is a sibling for him and to make my family complete but after all these years I havent so much spoken to a guy in a way of interest never mind hug, kiss or sleep with them.

I'm just reminded to myself too that I'm not seeing anyone and realistically I want to get to know/date a guy atleast a year or two before we try for kids. That means if I meet someone this year I'd be 29 and thats really close to being 30.

I want 3/4 kids before I'm 35 and I just don't see it happening and that saddens me deeply.

I am content with my son , I really am but the I have for him I want to share that with my other future children and to see them grow up, make a great life and share memories together.

What do I do ?

Do I date online, do I go out there and look for someone? Cause 5 years is a long time!!!

I never really go out because I'm constantly watching over my son so that is a disadvantage when it comes to dating in the future