<human>: Can you summarize the given text in a few sentences?

Throwaway because I have many friends who reddit

It's fairly simple. I'm a 23 y/o male with 1 serious relationship in my past. She's 29 (turning 30 next month), and she's had a multitude of both casual and serious relationships. She lived with a previous boyfriend of hers when she was my age. 

I don't know what to do. I love her more than I knew I could- I just have insecurities and jealousy issues that I suppose come with being a recently-turned 23 y/o. I also worry about the age difference. I'm afraid that I'll grow to resent her if we get married, and that I'll feel that she robbed me of my 20's. That being said, I've had a lot on my plate- 15 hrs of class this semester, working 40 hrs/wk in a very demanding job, and dealing with bullshit of parents getting divorced (not necessarily emotionally based, but having to help parents/siblings move, dealing with new house purchases, etc), it's been a lot. Sometimes I feel like I'm taking the stress of everything out on my relationship, other times I feel like the worry about her past and the age difference is legitimate. 

We've talked about everything (including this)- I understand the biological clock is ticking, and that a decision regarding our relationship needs to be made within the relatively near future, but she's made it clear that she loves me more than any of her other boyfriends. I have no reason not to believe her. I love her so much, and life without her seems impossible, but these thoughts of her living with another guy/being with other serious boyfriends drive me crazy. Additionally, I get really scared by the idea of me growing to resent her due to the age difference, and her somehow stealing my youth from me. I feel especially bad because when we first started dating, she laid everything out on the table, and was wary of dating me/someone my age & with my "experience" for these exact reasons, and I assured her it wouldn't be a problem. I suppose I'm just being jealous/shitty, but any advice from someone in a similar situation is appreciated.
<bot>: Girlfriend is older/has history. I'm under a lot of stress. Am I just being jealous & shitty, or do I have reason to worry?