I have a smaller dick and I can tell you that when I was your age I faced the same situation.
The first issue about when to teller her or let her know depends on the situation. The best way I addressed it was by mentioning it to her while kissing and being upfront about it. Not necessarily being appologetic but having some humor about it helped.
The second issue about cumming fast happened to me also when young. What I learned was to realease some of the pressue by masturbating about 6 hours before going out. That way I would not be too anxious and cum so quickly. Having a lot of foreplay works for me too before penetration. Learning to provide oral satisfaction helps also and your gf should be happy with your overall peformance.
Hope it helps.
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