请给我一次表白的机会英文怎么说?

Please give me a opportunity to express my feelings .

这里“机会”应该用opportunity

chance多指偶然的机会，含有侥幸的意味在内；opportunity多指特殊的机会，含有期待的意味。两者有时可以互换。chance可表示可能性，而opportunity不能。如：
A strange chance had landed me upon the French coast .
一个奇怪的机会使我站在法国的海岸上。

She waited a long time without finding opportunity for a new departure .
她等了很长时间都没有找到新的动身机会。

Please give me an opportunity to confess!

Please give me a chance to express my love

简单点
Please give me a chance to tell you my feelings.

please give me a chance to show\profess\unburden my love for you.

来个感情色彩强烈一点的嘛！～
Only a chance, please! Let me show myself!