I wouldn't let the lack of a cofounder stop you from trying. If you start on something you can handle on your own, you'll:
1. better understand your strengths (i.e. what you have to offer)
2. better understand your weaknesses (i.e. what you'd like in a cofounder)
3. know how to get started. (huge!)
All of these things will make you a more valuable partner in the future. While a cofounder could bring value, I wouldn't consider the lack of cofounder a deal breaker for moving forward.
1. better understand your strengths (i.e. what you have to offer)
2. better understand your weaknesses (i.e. what you'd like in a cofounder)
3. know how to get started. (huge!)
All of these things will make you a more valuable partner in the future. While a cofounder could bring value, I wouldn't consider the lack of cofounder a deal breaker for moving forward.