ても始まらない【てもはじまらない】

ても始まらない follows a verb's て-form and says that doing it gets you nowhere: "there's no point ~ing", "~ won't get us anywhere". Literally it is "even if you ~, nothing starts", so it pushes the listener to stop and get on with something useful.

The verb is in the て-form, and する becomes しても.

• × 悩むても始まらない → 悩んでも始まらない

Saying what to do instead

The verb is usually something unproductive that is already going on – worrying, complaining, regretting, waiting. A second clause with から or ので then says what to do instead, often with a volitional 〜よう.

てもしょうがない says much the same. ても始まらない is a set phrase of conversation, mostly in the plain form; the polite form is てもはじまりません始まりません.