Many people get confused between whether to use “even though” or “even if” Even some
native speakers get them wrong. Let’s take a look at the following examples which clarify
the exact meaning.

Even though it rained, we still went out.
Even if it rains, we will still go out.

In example number one, this is a fact. It rained and despite this fact, we went out.
In example number two, this is a hypothetical situation. We are thinking of a possibility.

More examples are as follows:
Even though I work a lot, I still never seem to have enough money to pay everything. A real
situation. (Despite the fact)
Even if I worked hard, I would still never have enough money to pay everything. An unreal
situation. (Whether or not I worked hard, I would not have enough money)

References: English Grammar Reference Book - Jacqueline Melvin

Even though= past participle
Even if= present participle