Experience, Experience can make the difference. Also, have you tried lube inside the condom?
This makes for more slipping and sliding and can slow down the process.
Additionally, you can withdraw and grip the base of your penis to slow yourself down.
In summary, all sex is good, some is even better. Practice, Practice.
Additionally, I suspect that placing the condom on your penis causes you to actually jump start the action. Experience here can also help.
Sometimes I place the condom when I am fairly soft. Then playful foreplay helps it grow and finally penetration. Slow and easy also helps. It just depends. Have a blast with the experimentation.