I had my eldest when I was 19, next one when I was 20, then a 10 year gap. Do I regret it? NO.
Although, of course, there are aspects of having kids younger that are more difficult, I wasn't financially comfortable for a long time, it was crap struggling for basic things, everyone wants the best for their kids.
I was lucky that my parents were super supportive and I still maintained a reasonable social life.
I don't feel as though I missed out on travelling, uni etc, instead, I feel like perhaps I wasn't best equipped to give my kids what they really needed, either financially and in some instances emotionally. However, on the flipside, my girls are 10 and 11 now and they love having a younger mum, I am close enough in age to them to still be on their wave length and we have a really lovely relationship - they really notice how much older their friends mums are.
The fact is, I have grown up with my kids, having had my third at 29, I can say quite honestly am a very different mother to my baby this time round, but I don't have the same boundless energy I had as a younger mum, I remember before wondering what all the fuss about sleepless nights was, at that age, you cope better physically I guess.
In all and perfect honestly, I feel as though I am much better equipped to be a mother now than I was 10 years ago, but hey, my girls area pretty decent kids and whilst I doubt they would call me a perfect mother, I think they are reasonably happy with their lot! As a parent you are your own harshest critic, and I do have regrets about the type of parent I was in my early 20's, but I have learned and moved on.
There are pro's and con's to both, I didn't plan to have children young, so I guess you have a choice and need to be 100% certain it is what you want, it really doesn't sound like you are!