When you start you'll need a much lighter weight that doesn't weigh you down.
One other thing to consider, and I know this is going to be a problem for some, but consider buying a good pair of shoes that have good cushioning in them. If you have a very deep squat you will feel the full weight on the outside of your feet and heels due to the difference in length between your feet when you squat.
If you are getting tired and sore from heavy resistance training, you are on the wrong track unless your main workout is aerobic. You can do a variety of resistance strength exercises like bench, chest press, and leg press but the key to good results are these: High reps exercise with a lot of weight, i.e. the barbell, dumbbells. The most important thing is to do at least 20 reps using free weights and less than 10 reps using machines or plates. Your resting heart-rate/temperature are taken at the end of each workout. If they are higher than you would like to have them, increase your training or decrease the weight so that they can go below 95F or 85F.
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If at all possible, do your weight lifting out of the gym with a buddy or partner. I would recommend a friend from a gym or other workout place that you could trust. The other piece of the puzzle is to have a quality nutrition protocol. I would recommend eating clean, whole foods as much as you can. In terms of your nutrition, it is an overall health issue.