Most importantly, have you talked to your coach about this? If you've invested in a coach, it's extremely important you utilize her, especially for questions like this. Has your coach been able to watch you race? She might have some insights for you.
Were these races crits? You don't mention what type of race, but you do mention spectators, so I'll assume they're crits.
A good rule of thumb is the shorter the race, the longer the warm-up. For a crit, I typically recommend 45-50 minutes including 5 short hard efforts (ranging from 15 - 60 seconds). During the warm-up you'd ramp up your intensity gradually so there would be longer, sustained, higher HR work near the end of the warm-up.
You also need to time your warm-up so you don't finish too soon -- you don't want to stand around waiting for your race for more than about 15 minutes. Another technique some racers use is to do a sprint effort as you move to the line.
Crits are tough. They typically start very fast but then mellow out a bit after the first few laps. If you can hang for the first 10 minutes, you should be able to survive until the end of the race.
Positioning is crucial. Depending on field size, you really need to position yourself as close to the front of the pack as possible (without being ON the front). The further back in the pack you are the harder the race will be (physically and mentally) because of the constant surging (slowing down & accelerating @ the corners).
Don't be too tough on yourself. You've done two races. That's really nothing. I know some great racers (CAT1 & CAT2 women) who couldn't hang in the first few crits they did. Try to learn something every race you do, race frequently, and keep an open mind.
And talk to your coach, okay?



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