Hand 1 87s UTG
Just open fold and save your chips. As played fold to the 3-bet is fine. Dont rabbit hunt! The fact, you would have flopped a straight, does not matter even the slightest.
Hand 2
Identical to hand 1.
Hand 3 KQo MP
Preflop I would isolate the limper to around 4BB rather than invite a multiway pot. On the flop I would just call. You allowed 4 other people to see the flop for cheap, and the SPR is pretty deep, so if you play for all the chips now, you usually end up getting action mainly from better hands. After having raised the flop, you are however more or less committed to the pot. Betting the turn is standard, and when UTG lead for the rest of his chips on the river, you are usually beat, but you are also getting a great price, so I dont blame you for calling it off. The main point of the hand is, that you should never see the river like this, because you should have raised preflop.
Hand 4 94o BB
Not sure why you shared this? Very easy fold preflop, which you did.
Hand 5 AKo UTG+1
Standard open and standard call of his 13BB rejam. Just a bit unlucky to run into KK. Spots like these happen all the time in poker, and they are nothing to worry about. You will also have KK, when someone else have AK, and then they will be the ones getting it in bad. Or your AK will suck out on their KK.
Hand 6 T6o BB
This hand is so bad, that even against a min-raise I would not defend it. You got bailed out by flopping a straight however, and at this point you had a very easy check-jam, when he overbet the pot on the flop. He massively overplayed his AK, and you got max value. Nice hand.
Hand 7 AA MP
With just 7BB open jamming your entire range is totally standard. You got called by a hand, you had drawing almost dead preflop, but unfortunately the opponent got lucky and binked a massive suckout. Such is poker, next tournament please.
Summary
Based on these 6 hands you are playing to loose preflop opening to wide from EP and also defending your blinds to wide. You are also playing to passive preflop not isolating with KQ but just limping behind. These are typical beginner mistakes, and I suggest you to study some preflop charts and get your ranges at least somewhat closer to, what they suggest.
The second theme is, that you are very results oriented focusing on hands, where you had an easy preflop decision with a premium hand like AA or AK but ended up losing. Or where you made a correct fold with junk in a situation, where you would have smashed the flop. This is also a typical beginner mistake, and the advice is to simply stop caring about short term results, even though its human nature to do so. Focus instead on the process and your decision making, and then results will take care of themselfes in the long run.