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I just started playing ME 1 but there are too many side missions i don't want to do them all its quite annoying but i heard that its important to do them because choices matter in this game, but i just want to play the main storyline and i don't want to waste time on other missions its quite annoying to do all of them so what should i do.
If you're playing the entire trilogy, you will want to complete as many side missions as possible for not only the carryover effect, but the fact that the experience will ensure you make it to level 50 (which is the level cap on an initial playthrough). You'll get better import bonuses when starting ME2 that way.
Keep in mind that these games (ME trilogy) have a lot of content - that is the nature of an RPG after all. If you're looking to triage which missions have the most impact later on in the series, LordTrinen put together a nice guide that gives a tight, minimal spoilers rundown of each mission in the series grouped by importance:
Make sure you do the VI mission on The Moon. You unlock your class upgrade that way. I would also strongly suggest doing Wrex: Family Armor. It becomes important later in the game.
If you are mostly interested in the story, I would also do the Admiral Kahoku quest chain. It doesn't directly affect the sequels in terms of choices, but it is the introduction to a storyline that ends up being a big deal in both ME2 and ME3.
Otherwise, mostly the side missions just add some flavor. A character might show up in a cameo or send you an email or something. The important choices occur during the story missions.