Girlfriend is great, but why do I feel this way?

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My girlfriend wants to settle down in the near future and has expressed interest in getting married. However, I'm unsatisfied with the relationship right now. I want go out with other people and experience new things because I feel I haven’t meet enough people to feel comfortable settling down yet. Additionally, she isn't fulfilling my need for intimacy which is making me a bit moody. She is stuck in a dead end job that is holding her back, and she isn't really showing a real commitment to improving her situation or herself as a person. She fights with depression and a lot of problems holding her back from achieving her goals in life. To top it all off it's a long distance relationship where we switch off driving a couple of hours only to see each other every other weekend. It’s a rough drive and a lot of time and money. Despite this, I endure it because she is an exuberant, supportive, and selfless person, who really wants to overcome her problems. She always expresses her feelings of worthlessness when we talk about education, I get frustrated and try to suggest ways for her to improve her life. I want to help support her anyway I can because I know without my fervent support nothing would change for her. I have a great deal of love for her, and I just can’t decide what to do. I think she is an excellent person and if not for my own insecurities about settling down I would ask her to marry me once I graduated. I don’t know if my feelings of dissatisfaction will just pass with time, or if I will be happy settling at this point in my life. I just want to talk to other people and gain perspective about what life might hold for me, and if I should take a chance this summer while I’m free. Picture unrelated.